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In page Lake Titicaca:

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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.[citation needed]