Lake Titicaca has a surface altitude of 3,812 metres (12,507 ft) and is said to be the world’s highest navigable lake, referring to navigation by commercial vessels. Measured by water volume it is the largest lake in South America and the 14th largest in the world. It has a surface area of approx. 8,372 km2 / 3,232 sq mi (which varies slightly between wet and dry seasons) and is shared by Peru and Bolivia. In Bolivia the Lake is divided into 2 sections, the narrow Strait of Tiquina separates the Inner Lake (also called Huiñay Marca / Marka or Lago Interior, a small part of which belongs to Peru) from the main part of the Lake. This gallery contains images from the Bolivian side of the Lake (which is part of La Paz Department) and also the popular tourist town of Copacabana. Images of the Peruvian side can be seen in this gallery.