The Reventazón River, , is a river in Costa Rica.
The Reventazón River forms part of the Reventazón-Parismina drainage basin. It is long and flows into the Caribbean Sea. It starts at the base of the Irazú Volcano, passing through the east side of the Central Valley, and flows through the Orosàand Turrialba Valleys. After reaching the Caribbean coastal plains, it joins the Parismina River and forms what is called the Reventazón-Parismina.
In its upper segments, the Reventazón River is the source of 25% of the drinking water of Costa Rica's largest metropolitan area, centered on San Jose.
The river is very important for power generation. Three reservoirs in the river, Lake Cachà(100.8 MW), Angostura (177MW), and Reventazón Dam (305.5MW), are used for generating a significant share of Costa Rica's electricity. The dam for the third reservoir, Reventazón (305MW), was completed and opened in 2016. The river is also important for tourism, especially for whitewater rafting.
Rafting is practiced on the river, which has Class 2-3 rapids in its Florida section.
The bobo mullet (Joturus pichardi) is native to the Parismina River and is fished here for subsistence consumption and sometimes commercially.