The Cayenne River is a river located in the region of French Guiana, a territory of France in South America. It flows through the city of Cayenne, which is the capital of French Guiana. The river is an important waterway for transportation and local ecosystems, supporting various species of flora and fauna. The river is approximately 80 kilometers long and empties into the Atlantic Ocean. Its basin is characterized by tropical rainforest, which contributes to the rich biodiversity of the area. The Cayenne River plays a significant role in the local economy, providing resources for fishing and tourism.