All Champions originate from the world of Runeterra.
Runeterra
Runeterra is divided among ten Nations; Freljord, Noxus, Demacia, Ionia, Piltover/Zaun, Bilgewater, Shadow Isles, Ixtal, Shurima, Targon
Important Nations
Demacia is a mountain nation of Humans, Shurima is a fallen empire who once ruled over runeterra as Gods, The Shadow Isles is the home of a portal to a dimension of darkness inhabited be demons.
Piltover/Zaun
Piltover and Zaun are considered the same nation but are very different, Piltover is a Utopia on the highest levels of a city, Piltover is built atop Zaun, a sprawling slums of miners and servants