A trail of some 70 km follows the Wahai (Pasahari)-Manusela-Hatumeten traditional route along the eastern boundary of the Park. The trail itself is narrow but clearly marked, at first in the north following the Wae Isal river, often along the gravel banks, and in the south of kaloa, the lowland alluvial plains gives way to a series of small limestone ridges bisected by small stream. South of the Manusela valley the trail rises steeply to the ridge crests of the Merkele ridge (approx. 1,750 m) it is a one half day walk to Hatumeten, down very steep, slippery, narrow and rocky path, along the deep limestone valley that finally contours around 5 km before reaching Hatumeten on the south coast.
The whole trail length is approximately 70 km and takes a minimum of 6 days to walk from north to south, a one or two day rest in the manusela valley is recommended and on the whole a journey af about 7 days is preferable.