Lariang River is a river in Sulawesi, Indonesia.CourseIts tributary, the Pebatua River, arises in Donggala Regency, Central Sulawesi, and forms the Lariang when it is joined by the Koro River from the left (south) at. The river, as the Lariang, goes on to form part of the border between Central Sulawesi and West Sulawesi and enters the Macassar Strait just past the town of Lariang. The mouth is at.