Rivas is a district of the Pérez Zeledón canton, in the San José province of Costa Rica.

Excavations at Rivas began in 1992 under the direction of Jeffrey Quilter of the Peabody Museum of Archaeology and Ethnology, Harvard University.

His excavations identified structures similar to those found by Drolet at the site of Murciélago, Costa Rica.

Construction of these structures consisted of river cobbles aligned in circular patterns of various sizes, typically with adjoining rectangular patios.

Chiriqui period cemeteries located near the site may have corresponded to specific habitation areas within the Rivas population.

A nearby staircase may have connected this portion of the site to the Panteón de La Reina on the overlying ridge.

The research team focused on diagnostic pieces, such as rims and decorated body sherds, in their collection efforts.

This pottery style is generally considered to be "fiesta ware" of the Chiriquí Period in the chronology of Costa Rican art.

Ground stone artifacts were rarely found and consisted of one adze, 8 celts, and fractured remnants of manos and metates.