The island of Amantaní, belonging to the district of the same name in the Puno Region, Peru, is located east of the Capachica peninsula [4.4 km], and north of the island of Taquile [8.1 km], on Lake Titicaca .
It is an almost circular island with an average diameter of 3.4 km. It reaches an area of 9.28 km², being the largest island in the Peruvian part of the lake (and the second in relation to all of it, since the largest is Isla del Sol, with an area of 14.5 km²). Its maximum height, at the top of Mount Llacastiti, is 4,150 m a.s.l., that is, 340 m above lake level (3,810 m a.s.l.).