This was the first dam built on the Balsas River. The southeastern corner belongs to the Balsas River basin. The Nexapa River is a tributary of the upper portion of the Balsas. Tierra Caliente and is situated in the lowlands along the Balsas River. Balsas River valley continues downstream into Guerrero state. In 1960, it was subordinated to the Balsas River Commission. The climate of the Balsas dry forests is tropical and subhumid. The Balsas dry forests occupy the basin of the Balsas River. Seven hydropower projects are envisaged on the Balsas River. The Balsas River basin has witnessed much economic development. With a length of some the Balsas River is one of Mexico's longest rivers. Costa Grande extends west of Acapulco to the Balsas River. The latter is found mostly along the Balsas River. The southwestern part of the state is dominated by the Balsas River basin. It is located on the Balsas River about southwest of Mexico City.