The Kherülen (Herlen, Kherlen) river rises near Hagiin Har Nuur, Khan Khentii Strict Protected Area, Hentiy Province, Mongolia, near the watershed between the Baikal (Arctic) and Pacific basins.
The Kherülen (Herlen, Kherlen) river rises at near Hagiin Har Nuur, Khan Khentii Strict Protected Area, Hentiy Province, Mongolia, near the source of the Onon rive and about 100 km west of Onon. Its source is near the watershed between the Baikal (Arctic) and Pacific basins.