Cuyuní
| Cuyuní | ||
 Río Cuyuní in the extreme northwest in the catchment area of the Essequibo |
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| Data | ||
| location | Venezuela and Guyana | |
| River system | Essequibo | |
| Drain over | Mazaruni → Essequibo → Atlantic | |
| muzzle | in the Mazaruni shortly before its confluence with the Essequibo near Bartica Coordinates: 6 ° 23 ′ 9 ″ N , 58 ° 41 ′ 20 ″ W 6 ° 23 ′ 9 ″ N , 58 ° 41 ′ 20 ″ W
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| length | 618 km | |
| Left tributaries | Rio Yuruari , Río Corumo | |
| Right tributaries | Wenamu / Río Venamo | |
The Cuyuní ( Spanish río Cuyuní , English Cuyuni River ) is a river in northern Guyana and eastern Venezuela . The river acts as a demarcation line between the warring countries Venezuela and Guyana. There are always small skirmishes between units from both countries.
The river has a length of 618 km. It flows into the Mazaruni , which then unites with the Essequibo . The Guyanese part of the Anacoco Island in the Cuyuní River was annexed by Venezuela on October 12, 1966 .