According to Inca myth, Isla del Sol in Lake Titicaca was the birthplace of the sun. The island was a major sacred center connected with Inti, the Inca sun deity, and with the origins of the Inca people.
The island lies in the southern part of Lake Titicaca in present-day Bolivia. In accounts recorded by the chronicler Bernabé Cobo, the Sun emerged from the sacred rock of Titi Qala after a period of darkness or after a great flood. The rock was therefore treated as a place where the Sun appeared and as a foundation point of Inca sacred history.
The island was also linked to Manco Cápac, the legendary first Inca, who was said in some traditions to have emerged there or nearby. An Inca temple and pilgrimage complex developed around the sacred landscape. Isla de la Luna was another holy island in the lake, but it was not the island identified in this question as the Sun’s birthplace.