Which river runs through a disputed area between Suriname and Guyana?

Question

The Mekong River rises in the Tibetan plateau and runs through or between six countries - China, Burma, Thailand, Cambodia, Vietnam and which other?

Answer 1

Kutari
The River Courantyne and the river thought to be its source at the time, the River Kutari, formed the border between Suriname and (then) British Guiana until 1936. A dispute over the boundary since then has not been completely resolved. The other three rivers mentioned are in the region of Suriname's eastern border, with its neighbour France (French Guiana)., a disputed area also still not completely resolved.