Rivas is a modern hamlet located in the General River Valley of Costa Rica near the city of San Isidro. The town is positioned 1 kilometer north of where the Rio Buenavista and the Rio Chirripò Pacífico converge to form the Rio General. Rivas is located in the cantón of Pérez Zeledón in San José Province. This town lies south of a mountain chain Cordillera de Talamanca result of tectonic uplift between Cocos Plate and Caribbean Plate.