Amantani is an island on the Peruvian side of Lake Titicaca. According to a 1988 census, it had a population of 3,663 Quechua speakers divided among about 800 families. The most current census (2017) estimates a population of 3,557. The island is circular and about 9.28 km2 (3.58 sq mi) in size. It has two mountain peaks, Pachatata and Pachamama, with ancient Inca and Tiwanaku ruins on top of both. The hillsides are terraced, mostly worked by hand, and planted with wheat, quinoa, potatoes, and other vegetables. Livestock, including sheep, also graze the slopes.