The Corentyne / Corentyne / Corantijn River is a river in northern South America in the country of Suriname, it is the longest river in the state. The river originates in the Acarai Mountains and flows northward for approximately 724 km (450 mi) between Guyana and Suriname, emptying into the Atlantic Ocean near Corriverton, Guyana and Nieuw Nickerie, Suriname. A ferry service operates between these two towns.
The Guyana / Suriname border is the Guyanese river bank (the west bank of the river), but Guyana disputes this, based on the Thalweg Doctrine. The tribunal that defined the maritime boundary between Suriname and Guyana in 2007 confirmed Surinamese sovereignty over the full width of the Courantyne River.[1][2]
Small ocean-going vessels are able to navigate the river for about 90km, to Apura, Suriname.
The Wonotobo Falls, Frederik Willem IV (Anora) Falls, and the King George VI Falls are on the Courantyne river. Other falls include the Barrington Brown Falls and the Drios Falls.