Reventazón River forms part of the Reventazón-Parismina drainage basin, it is 145 kilometres (90 mi) long and flows into the Caribbean sea.

After reaching the Caribbean coastal plains it joins the Parismina River and forms what is called the Reventazón-Parismina.

[1] 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.

Three reservoirs in the river, Lake Cachí (100.8 MW), Angostura (177MW) and Reventazón Dam (305.5MW) are used for generating a significant share of Costa Rica's electricity.

[2] The bobo mullet (Joturus pichardi) is native to the Parismina River and is fished here for subsistence consumption and sometimes commercially.