* The Abyss: Index * Concordance * Layers * Burgs* 
* View Another Plane * 

 

The Abyss, also Demonholme to those of Ysgard, also Fiendholme to the Clueless of Krynn, also Jurgarten, meaning 'the misshapen lands,' to the elvish (seemingly infinite, unstable layers, possibly close to 900 in number, although that number changes. 703 mapped to date.)
(I) indicated an interdicted layer, RT a realm town, IT an independent town, Si a site. [*] indicates that the layer is one planned to be detailed at a later date. [#] indicates that the layer is a reworking of ideas found in the "Net AD&D Guide to the Abyss." {FoE} is Faces of Evil. (TGMM) is The Great Modron March. (AotA) is something mentioned in Green Ronin's Armies of the Abyss, and many of the layers are summarized here.
 

 PRIMARY WATERWAYS 

River Styx 
River Pyriphlegethon
LAYER 1: PLAIN OF INFINITE PORTALS (The Howling Threshold, Pazunia, the Palace of 1001 Closets, Jhaat) 

IT: Battle Not With Monsters 
IT: Broken Reach 
IT: Edge of Sanity 
IT: Mithrengo 
IT: Raazorforge (ITA) 
IT: Sonu-Aar'ri 
IT: Styros
Re: Gallowsgate (Chemelosian's realm)
RT: Gallowsgate (ruled by Jaranda)
Si: Doomguard fortress
IT: The Fortress of the Fallen Stair (TGMM) 
Si: Palace of the Princess of Pure Lust 
Si: Fortress of Ahazu the Seizer (AotA)
Si: Fortress of Aldinach of the Thirty-three Terrors (AotA)
Si: Fortress of Baltazo the Pitiless (AotA)
Si: Fortress of Laraie of the Unerring Bow (AotA)
Si: Dolorous Keep (Karlag’Fenzarl’s tower; by Morgan Barry)
Si: Lakes of Molten Iron 

Si: Ferrug (MotP3)
Si: Tower of Chiryn (WoW) 
Si: Xaos Kult Kamp (formerly near Plague-Mort: details in SIGIS issue 12)
IT: Amalrehtan (AotA)
Planar Path: The Styx
LAYER 2: "DRILLER'S HIVES" (layer of hivebroods)

LAYER 3: FORGOTTEN LAND 

LAYER 4: GRAND ABYSS 

Planar Path: The River Styx

Planar path: River Pyriphlegethon

Re: The Abyss of Ragnarok (Nastrond's realm)

Re: The Bottomless Pit (Abaddon's realm; AotA)

Si: Gulthrax

LAYER 5: "WYRMBLOOD" (I) discovered by Factol Jarkopple the Inflexible

RT: City of Caran 

Si: Black Tower 

Si: Iron Fortress 

Planar path: River Pyriphlegethon

LAYER 6: REALM OF A MILLION EYES (Great Mother's realm) 

RT: Failing Sight
LAYER 7: PHANTOM PLANE (KEARACKININ ) (Sess'inek's realm) 

LAYER 8: "SKIN-SHEDDER" (I) 

LAYER 9: BURNINGWATER (I) 

LAYER 10: "THAT HELLHOLE" (I) 

LAYER 11: MOLRAT (I) 

LAYER 12: TWELVETREES 

Si: Ship of Chaos (ITA)
LAYER 13: BLOOD TOR (Beshaba and Umberlee's realms; F&A) 

Si: Gallowshill, the Fortress of Taramanda (Hellbound)
Re: Deathkiss Keep (Sorche's realm)
LAYER 14: A'SHAD'IFOHG 

IT: A'Shad'Ifohg's Fall 
Si: The Tower of Fangs
LAYER 15: THE COURTS OF MUSTERING (Gurtheoinr's domain, formally V'aughrosfl's; formally Chilravion's)

LAYER 16: THE ENDLESS GRAVEYARD 

LAYER 17: THE WHISPERING LIGHTS (I) 

LAYER 18: CARNAXIUS (Sekhmeth's Realm)

RT: Jerat
RT: Wysval
Si: The Pyramid of Destruction
Si: The Sleeping Forest
Planar path: River Pyriphlegethon
LAYER 19: FALSERAPTURE (I) (Realms of the Evangelist,the Heretic, the Crusader, and the Apostate) 

Si: Library, Laboratory, and Monastery of Gresil
LAYER 20: CANDLESNUFF 

LAYER 21: THRONE OF SKULLS (Khorne's Realm) 

LAYER 22: EBON DEATH (Babau realm) 

LAYER 23: IRON WASTES (Kostchtchie's, Kostchei's and Chernabog's realms) 

Re: Tschyrtolikya
RT: Glacier Citadel
LAYER 24: TORPOR (Sleeping realm; A More Complete Guide to the Outer Planes, by Dave King) 

LAYER 25: NIGHTMIRE (Realm of the Three; A More Complete Guide to the Outer Planes, by Dave King) 

LAYER 26: MAGEBANE

LAYER 27: MALIGNEBULA (Lissa'aere the Noxious' realm; Hellbound) 

LAYER 28: THE MOUNTAINS OF MURDER 

LAYER 29: ROTTING CORPSE (Ghoul Realm) [#] [*]

LAYER 30: SLIMEFLOW 

Planar Path: The Styx

LAYER 31: DESERTS OF STILL SILVER (I) 

LAYER 32: THE DUNGEON DIMENSIONS (I) 

LAYER 33: HOLLOWSHELL (I) 

LAYER 34: COURT OF AESKYLOS 

LAYER 35: SENSELESS COURT OF SHABIRI

LAYER 36: ACID SCRUB [*]

LAYER 37: THE FEEDING REACH (I) 

LAYERS 38-40: COURT OF SCEIRION

Si: The Keep of Rhieaz

LAYER 41: PERVERSION TRIUMPHANT (Slaanesh's realm) 

LAYERS 42-43:TZARETCHUK(Realms of the Tzaretch) 

LAYER 44: STORM (cataboligne layer)

LAYERS 45, 46 AND 47: AZZAGRAT (TRIPLE REALM) (Graz'zt's realm; For Duty and Deity) 

RT: Argent Palace 
RT: Zelatar 
Si: Zrintor, the Viper Forest 
Si: The River of Salt 
RT: Samora 
Si: The Counting House
Planar path: King's Road 
LAYER 48: LAYER OF THE HUNT (Dance of Demons)

LAYER 49: THE HORRID SEA 

IT: Sanspathos, the Lingering City
LAYER 50: THE OCEAN OF DESPAIR (Dagon's Realm) 

LAYER 51: DEATHWINDS (Sammael's Realm)

Si: Keep of Walking Chaos
Si: The School of Terror
Si: Body Tower
Si: Chioa (Fortress of Eisheth Zenunim)
Si: Ruined world
LAYER 52: PLAINS OF THE DREAMER (Azoth's realm) 

Si: King's Road (Planar path)

LAYER 53: IMPALATOR (THE GLASS SPIKES) (I) [*] 

LAYER 54: COURT OF MORFLOS (Absorbed layer)

LAYER 55: GLASS SHARDS

LAYER 56: TIERS OF MYKHAZ 

LAYER 57: TORTUROUS TRUTH (Duke Alvarez's realm; FoE)

LAYER 58: THE TIERS OF PHELETHO

LAYER 59: THE SILVER VOID

LAYER 60: THE ELDRITCH HANDS

LAYER 61: UNKNOWN (CARYNACH)

LAYER 62: STING (Chask and Maughter's realms) 

LAYER 63: CHITINOUS (Mantha's realm) (I) [#] [*] 

LAYER 64: DIZALAKINE, the Gate of Entropy (Raum's realm; AotA)

LAYER 65: LOLTH'S WEB (Lolth's realm, formerally Zanassu's realm) 

LAYER 66: THE DEMONWEB PITS (Lolth's, Selvetarm's, and Keptolo's realm) 

Si: The Chamber of Enlightenment (Lualyrr's "realm")
LAYER 67: HEAVING HILLS (Hezrou realm) 

LAYER 68: UNNAMED (Void) (I) 

LAYER 69: THE CRUSHING PLAIN (I) 

LAYER 70: THE ICE FLOE (I) 

LAYER 71: SPIRAC 

LAYER 72: "DARKLIGHT" (I) 

LAYER 73: THE WELLS OF DARKNESS (I) 

LAYER 74: SMARAGD (Meershaulk and Ramenos' realms) 

Re: The Viper Pit (Sseth's realm; P&P)
LAYER 75: SRAOSHA (Azidahaka's realm; Armies of the Abyss)

LAYERS 76-78: unknown

LAYER 79: THE CYANIC FENS (Dance of Demons)

LAYER 80: "THAT MISERABLE PLACE" [*] 

LAYER 81: THELEMA (Socothbenoth's realm; AotA)

LAYER 82: JAHKLOUT (Dance of Demons)

LAYER 83: CIMMERIAN SHADE (Ahrimanes' Realm) 

LAYER 84: XIBALBA

LAYER 85: ABLINIKARN, THE EVERSHIFTING VALE (Nocticula's Realm; AotA)

LAYER 87: SALT DESERT (The Balance Website, defunct) 

LAYER 88: THE GAPING MAW (BRINE FLATS) (Demogorgon's realm; formerly Yam's realm) 

Si: Abysm (Demogorgon's palace)

Planar Path: The Styx

Planar Path: River Nihilus

LAYER 89: DEMOZG (Demogorgon's realm) 

Planar Path: River Nihilus

Planar path: River Pyriphlegethon

Si: Temple of Insanity

LAYER 90: GORGONASHK (THE STARS ARE BLOOD) (Demogorgon's realm; H4) 

Planar Path: River Nihilus

RT: City of All Demons

LAYERS 91-95: unknown 

LAYER 96: NOGARD 

LAYERS 97-99: unknown 

LAYER 100: THE TERRIBLE FORGE PRIMEVAL (Cabiri's Realm) 

Planar path: River Pyriphlegethon

LAYERS 101: THE ENDLESS ENIGMA

LAYERS 102-110: unknown 

LAYER 111: PLEROMA (Abraxas' Realm; AotA)

LAYER 112: STALKINGBONES (FONT OF SKELETONS) (I) [*] 

LAYER 113: THANATOS (THE BELLY OF DEATH) (Kiaransalee's realm, formerly Orcus' realm) 

Si: Desert of Bone Meal 
Si: Lake of Fire (H4: Throne of Bloodstone)
Planar path: River Pyriphlegethon 
Si: Valley of Crypt Things (H4)
Si: Skeletal Mountain (H4)
RT: City of Liches (H4)
RT: City of the Zombies (H4)
RT: Forbidden Citadel (H4)
Si: Ruins of Orcusgate (H4)
Si: The Great Mazes (H4)
RT: Naratyr, City of the Dead 
Si: Calciniferous Palace 
RT: Lachrymosa, the Cauldron of Tears 
RT: City of Straight Curves (H4)
RT: The Bucking City (H4)
RT: The Flickering City (H4)
RT: City of Fire (H4)
RT: City of Ice (H4)
LAYER 114: OPEN GRAVE (I) 

LAYER 115: SLOW DEATH (CAT'S MEOW; Planewalker.com) 

LAYERS 116-119: unknown 

LAYER 120: THE OFFAL PITS (THE MIDDEN) [#] [*]

LAYER 121: DEGRAZAZT 

LAYER 122: FALSE FALLOW (IPONYSS'ITHYSS)

LAYERS 123-127: unknown 

LAYER 128: THE SLUGBED (Lupercio's realm; FoE) 

LAYER 129: TOWERS OF BLACK IRON (Tuchulcha's realm)

LAYER 130: SALONS OF PLEASURE (Soneillon's realm)

LAYER 131: THE INVERTED ZIGGURAT (Marduk's Realm) 

Planar path: River Pyriphlegethon

LAYER 132: THE ABYSS OF FLAMES (Marduk and Ferror's Realm) 

Si: Chaos Cube

Planar path: River Pyriphlegethon

LAYER 133: THE CONSUMING FURNACE (Marduk's Realm) 

Planar path: River Pyriphlegethon

LAYER 134-141: unknown 

LAYER 142: LIFEBANE (Chemosh's Realm, OHG) 

LAYERS 143-155: unknown 

LAYER 156: BOGGYWOOD [*] 

IT: Abblerston
LAYERS 157-159: unknown 

LAYERS 160: BROKEN CHILD (by William Northern)

LAYERS 161-164: unknown

LAYER 165: THE ETHERIA

LAYERS 166-175: unknown

LAYER 176: HOLLOW'S HEART (Fraz-Urbluu's new realm; FoE) 

LAYERS 177-180: unknown 

LAYER 181: ROTTING PLAIN (Laogzed's realm) 

LAYERS 182-192: unknown 

LAYER 193: VULGAREA (Eshebala's realm; OHG) 

LAYERS 194-199: unknown 

LAYER 200: VERMILHON, The Cataracts of the Fallen, also known as Just Rewards (Mastiphal's Realm) 

Si: The River of Swords [*]

LAYERS 201-220: unknown 

LAYER 221: BLEKHOLE (I) [*] 

LAYER 222: SHEDAKLAH (THE SLIME PITS) (I) (Jubilex's and Zuggtmoy's realms) 

Re: Amoebic Sea

RT: Palace of Decay

Si: Pneumuglug

Re: Thallphytia (Zuggtmoy's realm)

LAYER 223: RARANDRETH (OFFALMOUND) (Moander's realm; now Lolth's realm; F&A; OHG; DD) 

LAYERS 224: MYCORGI (Zuggtmoy's former realm)

LAYER 225: DECAY (by William Northern)

LAYER 226: RESTARION, THE ROTTING PALACE (Sabnach's realm; AotA)

LAYERS 227-228: unknown

LAYER 229: LUCID DREAM (Curlonax's former layer)

LAYERS 230-232: unknown 

LAYER 233: THE WRITHING ABYSS (Leviathan Realm) [*]

LAYERS 234-236: unknown 

LAYER 237:THE PLAINS OF CHAOS 

Si: The Citadel of Law (Altair's home) 
Si: The Obsidian Cyst (the Bloodlord's home)

LAYERS 238-240: unknown 

LAYER 241: PALPITATIA (Grankhul's and Skiggaret's realms; OHG) 

LAYERS 242: THE SHIFTING LANDS (realm of Azael and J'angar, among others) [*]

LAYERS 243-245: unknown 

LAYER 246: THE JOTUN PITS (Grodog)

LAYERS 247-259: unknown

LAYER 260: THE GREEN ABYSS (Alrunes' realm) [*]

LAYERS 261-265: unknown

LAYER 266: ACID INDECISION (Tel'Quay's realm) 

LAYERS 267-273: unknown 

LAYER 274: DURAO (gateway layer) 

Si: Gluttonous Depravity, the Citadel of Feasting
LAYERS 275-287: unknown 

LAYER 288: DARK OASIS 

LAYERS 289-294: unknown 

LAYER 295: DESOLATE 

(by William Northern

Si: Army Training Camp (Lord Hugh's domain)

LAYER 297: THE SIGHING CLIFFS (Lynkhab's realm; FoE) 

LAYER 298: ABYSS OF BOILING OIL (1000 Hells)

LAYER 299: ABYSS OF BURROWING MAGGOTS (1000 Hells)

LAYER 300: FENG-TU (Tou Mu and Lu Yueh's realm) 

RT: Feng-Tu, City of Disease and Madness 
Si: Keui-Men-Kuan, Gate of the Demons 
Si: How Nai-ho (river)
LAYER 301: ABYSS OF UPSIDE-DOWN SINNERS (1000 Hells)

LAYER 302: ABYSS OF SEVEN BURNING SEAS (1000 Hells)

LAYER 303: SULFANORUM 

Re: The Red Pits of Sulfanorum (Ballock's realm)

Planar path: River Pyriphlegethon

LAYER 304: THE SCARLET PATH (1000 Hells) 

LAYERS 305-309: unknown 

LAYER 310: DAMERTH (Site is in Hungarian) 

LAYER 311: THE ENDLESS CAVERNS 

LAYER 312: THE FINAL HIGHWAY (Seere's realm; AotA)

LAYER 313: UNNAMED 

Si: Illssender's Tower (Hellbound)
LAYERS 314-316: unknown 

LAYER 317: THE TERMINAL ARCHIVE (Astaroth's realm; AotA)

LAYERS 318-323: unknown

LAYER 324: THEIVUKASH (Stromckkuk's realm) [#] [*] 

Si: Plains of Severed Hands

Si: Stromckkuk's Hill-fort

LAYERS 325-332: unknown 

LAYER 333: THE BROKEN SCALE (Hiddukel's realm; OHG) 

LAYER 334: UNNAMED (Eldanoth's realm; formally Orcus'?)

LAYERS 335-336: unknown 

LAYER 337: A'azax (Ythigart's realm; by Smeazel)

LAYER 345: FYERWOLD 

Planar path: River Pyriphlegethon

LAYER 346: LAIR OF SEMI-DEMONS (Throne of Bloodstone) 

LAYER 347: CHARNELHOME (Shax's realm; AotA)

LAYER 348: UNNAMED (Formerly Thralhavoc's realm) 

Si: Taelec Mirrimbar, the Fortress of Indifference (Tapheon's stronghold; Hellbound)
LAYERS 349-351: unknown 

LAYER 352: THE INCESSANTLY SUBLIME COURT (Obox-Ob's realm) 

LAYERS 353-355: unknown 

LAYER 356: AENAGADE

Si: Stronghold of the incubus Vile Rose
LAYERS 357-361: unknown 

LAYER 362: GHORNE (Dagoth's former realm; Realms of Infernus)

LAYER 363: THE LIVING SEA

LAYER 364: THE CAVERNS OF CHAOS (Anarazel's realm; AotA)

LAYER 365: KOLOPAN, THE SEETHING PASSAGE (Vepar's realm; AotA)

LAYER 366: AZGOROTH (Ojukalasogadit, the living layer) 

LAYERS 367-373: unknown 

LAYER 374: PLAINS OF GLASS AND TORMENT

LAYERS 375-376: unknown

LAYER 377: PLAINS OF GALLENSHU (armanite realm) 

RT: Blackmane (one of twenty-four stable-towns in the layer) 
RT: Oxblood (also a stable-town) 
RT: Amber 
RT: Basalt 
RT: Boneshard 
RT: Clay 
RT: Bloodstone 
RT: Broken Glass 
RT: Carrionheap 
RT: Jagged Edge 
RT: Jet Ichor 
RT: Shale 
RT: Stagnant 
RT: Cold Iron 
RT: Dark Spring 
RT: Gray Glass 
RT: Jade 
RT: Mageblood 
RT: Maroon 
RT: Obsidian 
RT: Ochre 
RT: Purpure 
RT: Silver Spike 
RT: Steelshank 
RE: Brokenhoof (Armat's realm)
IT: Bleeding Head
LAYER 378: unknown 

LAYER 379: FORCED HAND

LAYER 380: unknown 

LAYER 381: BODAK'S LAYER 

LAYER 382: unknown 

LAYER 383: GLABHELROR, the Abyss of Howlings (Glabrezu realm) 

LAYERS 384-386: unknown 

LAYER 387: WINGED DARKNESS (Ephialtes' realm) 

LAYER 388: MALDINACH, the Desert of Broken Dreams (Azazel's realm; AotA)

LAYER 389: PIBIUS (The Abyss of Happy Pink Clouds)
  
LAYER 390: THE HINGED PLAIN (THE CLAP) (I) [*] 

LAYERS 391-392: unknown

LAYER 393: ZEGRENTILANDIB

LAYERS 394-397: unknown 

LAYER 398: ROOT OF ALL EVIL

RT: Greenspawn
LAYER 399: WORM REALM (Urdlen's realm) 

LAYER 400: WOEFUL ESCARAND (nalfeshnee realm) 

Si: The Mountain of Woe 
Si: The Pits of Depair
LAYER 401: BLACK REGULUS (nalfeshnee and alastor realm; AotA) 

LAYER 402: unknown 

LAYER 403: THE RAINLESS WASTE 

IT: Mal Arundak, the City of Confusion (Fallen archon realm; FoE)
LAYERS 404-407: unknown 

LAYER 408: THALERIAK, THE FOREST OF NIGHTMARES (Tyrel's realm)

LAYER 409: FORBIDDEN LUST (Ereshkigal's Realm) [*]

LAYERS 410-420:unknown

LAYER 421: SALTED WOUND (Realm of the King of the Ghouls, vassal of Yeenoghu) 

LAYER 422: THE SEEPING WOODS 

     Re: The Seeping Woods (Yeenoghu's realm) 
     Re: Palace of Ill-Omen (Ma'azbert's realm) 

LAYER 423: SMOLDERING WASTE (Zalintar's realm) 

LAYERS 424-425: unknown 

LAYER 426: INSANE ILLITHID ELDER BRAIN (I) 

LAYER 427: DJAHANNAM (Eblitis' realm) [*]

LAYER 428: ZANDAKURA, [LIVING DESERT] (home of SHRIAXIT's and their lords)

LAYER 429: ANAGON (Realms of Anaroggg and Armon) 

LAYER 430: FATAL BLEEDING (I) (The Balance Website, off-Mimir) 

LAYER 431: CHAOTIC MEMORIES (I) (The Balance Website, defunct) 

LAYER 432: SURFACE (I) (by William Northern)

LAYER 433: ACID OCEAN (I) (The Balance Website, defunct) 

Si: The sea of dissolution
Si: The sea of hallucination
Si: The Sardonic Deeps
Si: The Devil's Library (Ambrose's kip)
LAYER 434: SHRIEKING LANDS (HOUSE OF MASKS) (I) [*] 

LAYERS 435-447: unknown 

LAYER 448: THE GREAT BORDELLO (Syliviana's realm) [#] [*] 

LATERS 449-450: unknown 

LAYER 451: THE BURNING LIBRARY (Whuzzat's realm) 

Planar path: River Pyriphlegethon

LAYERS 452-461: unknown 

LAYER 462: THE ATROCITY CAVERNS (I) [*] 

Re: Maw of Atrocity (Aunkaatr's realm, abandoned; a dead god of the meazels)
LAYER 463: TEHOM (Netbook of Witches and Warlocks)

LAYER 464: ABYSS OF ICE CREAM [*]

LAYER 465: HALLS OF THE WHISTLER [#] [*]

LAYERS 466-470: unknown

LAYER 471: SUCCUBI WOMB (THE FLESH PITS) (I) [*] 

LAYER 472: PARTIS (Terror's Rain) (Rosipeer's realm; by Nerrin)

LAYERS 473-486: unknown 

LAYER 487: LAIR OF THE BEAST AND MANSION OF THE RAKE (Kanchelsis' realm; OHG) 

RT: Feast Upon the Herd
LAYER 489: NOISOME VALE (Tarnhem's realm; deserted; Dungeon Builder's Guidebook) 

Si: Tarnhem's Manor 
Si: The River of Worms

Layers 490-492: unknown 

LAYER 493: SLEEPLESS (Siragle's realm; Dungeon #28) 

LAYERS 494-498: unknown 

LAYER 499: CARRORISTO (Hellbound) 

Si: The Iron Fortress of Carroristo (Hellbound)
LAYER 500: VOLCANOES OF GOTHMOG (Volcanoes leak exotic substances, like molten fat, boiling blood, mercury, lead, etc.) 



Planar path: River Pyriphlegethon

LAYER 501: PARADISE DEFILED (Ochremeshk's realm)

Planar path: River Pyriphlegethon

LAYER 502: THE JOVIAN MINEFIELDS

LAYER 503: TORREMOR (LAYER OF FLIES) (Pazrael's realm) 

Si: Onstrakker's Nest
LAYERS 504-522: unknown 

LAYER 523: LAKE OF FIRE (Theological quandry; by Greg Jensen) 

Planar path: River Pyriphlegethon (Guarded on this layer by warden archons)

LAYER 524: SHATTERSTONE (Vaprak's realm, OHG) 

LAYERS 525-529: unknown 

LAYER 530: KAZUM, THE CITY OF THE PIT [*] 

LAYER 531: VUDRA (Marilith realm, Dungeon #60) 

LAYER 532: ISLE OF THE APE (Mandrillagon's realm) 

LAYER 533: THE ENDLESS TORTURE (Bar-lgura realm) 

Si: Plains of Pain
LAYER 534: THE BLOODPYRE FIELDS (Flauros' realm; AotA)

LAYER 535: THE LANDLESS AERIE (Decarabia's realm; AotA)

LAYERS 536: THE FAIR DECEPTION (SIGIS 17) (tNAA)

IT: Madness 

Si: Ocean of Woe 

Si: the Gaming Fields 

Si: the Perch 

Si: Tornado Forest 

Si: Tower of Corruption 

LAYERS 537-545: unknown 

LAYER 546: THE NIGHTMARE CAGE (J'sald-Xerix's realm) (I) [#] [*] 

LAYERS 547-550: unknown 

LAYER 551: JINXLAND (Abyss of gremlins and Asima's Realm) 

LAYER 552: THE BLOOD MOON (Aseroth's realm) 

LAYER 555: MAGGOTLOCH (I) [*] 

LAYER 556: THE FESTIVE EVERLASTING (Ipos' realm; AotA) 

LAYER 557: SHADOWS OF NEVER-WAS

LAYERS 558-559: unknown 

LAYER 560: DEMISE (Soluman's Anguish) (By William Northern)

LAYERS 561: SHADDONON (Layer of Rhyxali, Princess of Shadow)

562-564: unknown 

LAYERS 565: SANDSLIDE (THE FALLING DESERT) (I) [*] 

LAYER 566: SOULFREEZE 

Si: Gateway to Paraelemental Ice (The Inner Planes Sourcebook)

LAYERS 567: BLOODFIELD [*] (Areex's Realm) 

LAYER 568: THE ETERNAL LISTS (Eligor's realm; AotA) 

LAYERS 569-571: unknown 

LAYER 572: MORTALUS (Mors' realm) 

LAYER 573: PLAGUE

LAYER 574: THE WITHERING MANGROVE (by Brian Biddick)

LAYER 575: AWASH (I) 

LAYER 576: THE SOAKING CANYON OF MALIGNANCY (Marbas' realm; AotA)

LAYERS 577-585: unknown

LAYER 586: PRISON OF THE MAD GOD (Diinkarazan's realm) 

LAYER 587: GRAVE WISDOM (B. Mooney)

LAYERS 588-589: unknown 

LAYER 590: STORMWINDS 

LAYERS 591-591: unknown

LAYER 592: THE BLACK VORTEX (Dance of Demons)

LAYER 593: PARCH (Mot's realm) 

LAYER 594: THE MISTLANDS (Bale and Ardat's realms) 

LAYERS 595-596: unknown 

LAYER 597: PRIVATE PERSECUTION (By William Northern)

LAYER 598:unknown

LAYER 599: THE SOULESS SOUNDING (DoD)

LAYER 600: ENDLESS MAZE (SHUBGOETIA) (Baphomet's realm, OHG) 

Si: Pale Night's claw fortress (FoE)
Re: Sea of Treachery (Canonfire!)
Re: Sea of Confusion (Canonfire!)
Re: The Dark Wood (Canonfire!)
Re: The Terror Caves (Canonfire!)
Re: Forest of Frenzies (Canonfire!)
Re: The Underkingdom (Canonfire!)
Si: Mystery Caves (Canonfire!)
Si: Palace of Knossus (Canonfire!)
LAYER 601: CONFLAGRATUM (Alzrius' realm, Hellbound) 

Planar path: River Pyriphlegethon

LAYER 602: CEREBULIM - THE HERMETIC HORIZON (Haagenti's realm; AotA)

LAYERS 603-611: unknown 

LAYER 612: PURGATION

LAYER 613: MORGONAUGH 

IT: Ber-Gorgan
LAYER 614: ACID SNOW

LAYERS 615-621: unknown

LAYER 622: ENGULFING ABOMINATION (I) [*] 

LAYER 623: THE REALM OF CHAOS 

Si: The Lake of Blood 
Si: The Cathedral of the Damned 
Si: Spires of the Arachnos
LAYERS 624-630: unknown 

LAYER 631: LABYRINTH

LAYER 635: DUIDAN (Behemoth's Realm; AotA)

LAYER 636: unknown

LAYER 637: CARYNACH, The Empty Place (no portals in or out; Canonfire!)

LAYERS 638-641: unknown 

LAYER 642: THE RED JUNGLE (Kali's realm) 

LAYER 643: CAVERNS OF THE SKULL (I) (Kali's realm) 

LAYERS 644-649: unknown 

LAYER 650: THE TIMEPIECE INFERNAL 

LAYERS 651-656: unknown 

LAYER 657: THE STEAMING FEN (Rod of Seven Parts)

LAYERS 658-664: unknown

LAYER 665: OPEN MAW (The Blood Wars trilogy; name by William Northern)

LAYER 666: DELETERIOUS COVENANT (Abraxas' Realm) [*]

LAYERS 667: LAYER OF EVIL INCARNATE (I) (also called the 666th) [*]


Si: The Terminus, Portal to "The Secondary Abyss"

LAYER 668: LAYER OF CHAOS INCARNATE (Realm of Ushablator the Chaos Horror) (I) [*]

LAYER 669: ANNIHILATION (Spheres of Darkness) (I) [#] [*]

LAYER 670: THE CRUMBLING HELL (I) [*] 

LAYER 671: NETHURIA, THE ABYSS OF CHAINS (Vucarik's realm) (I) [*]

RT: Mustering of Juggernauts

RT: Iron Liberation

LAYER 672: RIFT OF CORROSION (3e DMG; Monte Cook)

LAYERS 673-677: unknown

LAYER 678: FANTASIA

RT: Deocide
LAYER 679: DRAGGONNARA [THE LIVING REALM]

LAYER 680: VOLGAUTH (Armegeddon beasts; AotA)

LAYERS 681-682: unknown

LAYER 683: TUTIOLTH (I) 

LAYERS 684-698: unknown 

LAYER 699: ALL THINGS UNPLEASANT

LAYER 703: GALLERY OF AGONY (Litat's realm) 

LAYERS 704 and DOWN: Unknown 

WANDERING LAYER: THE RIVER OF LAND (Salafin's realm; uncatalogued) 
WANDERING LAYER: DEMONWING (Demogorgon's former realm; uncatalogued; A Paladin in Hell)