Térraba River (Spanish: Río Grande de Térraba), in the southern Brunca region of Costa Rica, is the largest river in that country.

[1] The indigenous Boruca language name is Diquís which means "great river".

[3] Pineapple plantations occupy 10,815 hectares (26,720 acres) in the basin, amounting to 21 percent of national production.

[4] Mangrove cockles (Anadara tuberculosa and Anadara similis), known locally as piangua, are collected in the mangrove swamps and mud at the mouth of the Río Grande de Térraba.

The Térraba empties in the Pacific Ocean with six mouths: Mala, Brava, Chica, Zacate, Guarumal and Sierpe.