The highest navigable lake in the world, on the Peru–Bolivia border, from which Inca tradition has Manco Cápac emerging to found their empire. In 2000 an underwater expedition found a stone terrace and a wall some eight hundred metres long on the bed near the Island of the Sun — pre-Inca Tiwanaku construction, now submerged. Offerings are still recovered from the bottom: gold figurines, incense, llama bones.