They are the best known stone sculptures of the Isthmo-Colombian area. The spheres are an assortment of over three hundred petrospheres found in Costa Rica, located on the Diquís Delta and on Isla del Caño.
The spheres are commonly attributed to the extinct Diquis culture and are sometimes referred to as the Diquís Spheres. They are thought to have been placed in lines along the approach to the houses of chiefs, but their exact significance remains uncertain.
The Palmar Sur Archaeological Excavations are a series of excavations of a site located in the southern portion of the country, known as the Diquís Delta, and have centered on a site known as Finca 6. The archaeological findings date back to the Aguas Buenas Period (300–800 CE) and Chiriquí Period (800–1550 CE).