Cuyuni River

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The Cuyuni River is a river in northern Guyana and eastern Venezuela. It rises in the Guiana Highlands of Venezuela. It descends northward to El Dorado, Venezuela, where it turns eastward and meanders through the tropical rain forests of Guyana, forming the international boundary for approximately 100 km (60 miles). It turns southeastward, flowing to its confluence with the Mazaruni River.

The Kamaria Hydroelectric Power site is located on the Cuyuni River in Guyana.

The river is a source of alluvial gold.

Ankoko Island is at the confluence of the Cuyuni and Wenamu River. Venezuela annexed the Guyanese half of the island in 1966.

In 1681, an island in the mouth of the Cuyuni River was cleared and planted with cassava for the use of the Dutch garrison. By 1694, a new plantation on the Cuyuni River above the fort was established. By 1703 a Posts was established on the Pariacot Savannah, in the upper Cuyuni.