The Ayo Rock Formations are monolithic rock boulders located near the Ayo village, about 3.2 km from the natural bridge when heading towards Casibari.
Towering stone boulders, placed in such close proximity and in unusual designs, combined with the tranquil environment of Ayo, create a sense of awe and an understanding of why the area was once considered a sacred site by the island's original inhabitants - the Arawak Indians.
The Arawak Indians would carve paintings into the rocks called petroglyphs while performing religious rites. These rock drawings, date back thousands of years at this site, where huge stones appear to have been scattered like marbles by an errant giant.
One of the unusual and notable rock formations is the Casibari Boulders, which are tonalite rocks seen to the north of Hooiberg. Modern pathways have been constructed in order to help visitors better explore this ancient site.