Lake Titicaca is a large, deep lake in the Andes on the border of Bolivia and Peru, often called the "highest navigable lake" in the world. It sits at an elevation of 12,500 feet. On the lake, various native Peruvians thrive on their own island - some made made naturally from the earth and other islands are made made reed islands.
Other cultures lived on Lake Titicaca prior to the arrival of the Incas. In 2000, a team of international archaeologists found the ruins of an underwater temple, thought to be between 1,000 and 1,500 years old, perhaps built by the Tiwanaku people.