The Rivière de Sinnamary is a river located in French Guiana, a region on the northeastern coast of South America. It flows through the Amazon rainforest and is known for its rich biodiversity. The river is approximately 100 kilometers long and plays a crucial role in the local ecosystem, supporting various plant and animal species. The river's name is derived from the nearby town of Sinnamary, which is situated at its mouth. The area around the river is characterized by lush vegetation and is part of the larger Amazon Basin, making it an important site for environmental studies and conservation efforts.