The Tárcoles River, also called the Grande de Tárcoles River or the Río Grande de Tarcoles, in Costa Rica originates on the southern slopes of the Cordillera Central volcanic range and flows in a south-westerly direction to the Gulf of Nicoya.

[1][2] The river's upper reaches form the northern border of the Carara National Park.

[1] It is a habitat for American crocodiles, while the marshes located at the river's mouth have many waterfowl and wading birds.

The avian biodiversity is substantial including rare birds such as Agami Heron, Rufous-necked Woodrail, Jabiru, Yellow-billed Cotinga and recently found an Orinoco Goose.

Less commonly seen are Silky Anteater, Sloths, Grinson, Jaguarundi, River Otter and Northern Tamandua.