Isla del Sol (Island of the Sun) is an island in the southern part of Lake Titicaca. It is part of Bolivia. There are over 80 ruins on the island. Among the ruins on the island are the Sacred Rock, a labyrinth-like building called Chicana, Kasa Pata, and Pilco Kaima. In the religion of the Incas, it was believed that the sun god was born here.