evidence: The Coeroeni River is in South America, specifically around Southwest Suriname. Considered a large river, the Coeroeni River starts at the Tumuc-Humac Mountains, creating a drainage divide between Brazil, Suriname, and Pará, and continues flowing northward. The river is located downstream of the Kutari (or Koetari) River, a small tributary that sits in Southern Suriname. The area surrounding the Coeroeni River, alongside the Upper Corentyne and Kutari Rivers, makes up the Tigri Area, an area of political dispute between Suriname and Guyana. Its waters are sourced from Suriname's Kutari, Aramatau, and Sipaliwini Rivers. [...] The Coeroeni-Lucie area (which encompasses the Coeroeni River) is part of the Precambrian Guiana Shield, a geological formation in South America approximately 1.7 billion years old! The Guiana Shield is about 270 million hectares and includes other parts of Colombia, French Guiana, Guyana, Venezuela, and Suriname. This geological formation is significant, containing 18% and 20% of the world's tropical forests and freshwater. [...] The Coeroeni River, together with the Upper Corentyne River and the Kutari River, encompasses the area that comprises the Tigri Area, a "triangular" area of an ongoing dispute concerning territory boundaries between Guyana and Suriname. Also known as The New River Triangle, this conflict has separated both sister countries, putting them at odds.