Why Did Ancient Peoples Make the Massive Diquís Sphere Stones in Costa Rica?
The stone spheres of the Diquís Delta in southern Costa Rica constitute one of the most visually arresting and least understood monumental traditions in precolumbian Mesoamerica and lower Central America. Numbering over 300 documented examples, these near-perfectly spherical objects range from a few centimetres to over two metres in diameter, with the largest specimens weighing approximately 16 tonnes. They were produced by peoples ancestral to the modern Boruca and other Chibchan-speaking groups, primarily during the Aguas Buenas (300–800 CE) and Chiriquí (800–1550 CE) periods. Four archaeological sites containing stone spheres — Finca 6, Batambal, El Silencio, and Grijalba-2 — were inscribed as a UNESCO World Heritage Site in 2014.
Introduction
The stone spheres of the Diquís Delta in southern Costa Rica constitute one of the most visually arresting and least understood monumental traditions in precolumbian Mesoamerica and lower Central America. Numbering over 300 documented examples, these near-perfectly spherical objects range from a few centimetres to over two metres in diameter, with the largest specimens weighing approximately 16 tonnes. They were produced by peoples ancestral to the modern Boruca and other Chibchan-speaking groups, primarily during the Aguas Buenas (300–800 CE) and Chiriquí (800–1550 CE) periods. Four archaeological sites containing stone spheres — Finca 6, Batambal, El Silencio, and Grijalba-2 — were inscribed as a UNESCO World Heritage Site in 2014.