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Isla del Sol

Situated on the Bolivian side of the lake with regular boat links to the town of Copacabana, Bolivia, Isla del Sol ("Island of the Sun") is one of the largest islands of the lake. Geographically, the terrain is harsh; it is a rocky, hilly island. No motor vehicles or paved roads are on the island. The main economic activity of the approximately 800 families on the island is farming, with fishing and tourism augmenting the subsistence economy.

Over 180 ruins remain on the island. Most of these date to the Inca period around the 15th century AD. Many hills on the island contain terraces, which adapt steep and rocky terrain to agriculture. Among the ruins on the island are the Sacred Rock, a labyrinth-like building called Chinkana, Kasa Pata, and Pilco Kaima. In the religion of the Incas, the sun god was believed to have been born here.

During 1987–92, Johan Reinhard directed underwater archaeological investigations off of the Island of the Sun, recovering Inca and Tiahuanaco offerings. These artifacts are currently on display in the site museum of the village of Challapampa.