Thimlich Ohinga is a complex of stone-built ruins in Migori county, Nyanza Kenya, in East Africa. It is the largest one of 138 sites containing 521 stone structures that were built around the Lake Victoria region in Kenya. These sites are highly clustered. The main enclosure of Thimlich Ohinga has walls that vary from 1 to 3 meters in thickness, and 1 to 4.2 meters in height. The structures were built from undressed blocks, rocks, and stones set in place without mortar. The densely packed stones interlock. The site is believed to be more than 550 years old.