<P> It is often called the "highest navigable lake" in the world, with a surface elevation of 3,812 metres (12,507 ft). Although this refers to navigation by large boats, it is generally considered to mean commercial craft . For many years the largest vessel afloat on the lake was the 2,200 - ton, 79 - metre (259 ft) SS Ollanta . Today the largest vessel is most likely the similarly sized, but broader, train barge / float Manco Capac, operated by PeruRail (berthed, as of 17 June 2013, at 15 ° 50 ′ 11" S 70 ° 00 ′ 53" W ﻿ / ﻿ 15.8364 ° S 70.0147 ° W ﻿ / - 15.8364; - 70.0147, across the pier from the Ollanta). Numerous smaller bodies of water around the world are at higher elevations . </P> <P> The lake is located at the northern end of the endorheic Altiplano basin high in the Andes on the border of Peru and Bolivia . The western part of the lake lies within the Puno Region of Peru, and the eastern side is located in the Bolivian La Paz Department . </P> <P> The lake is composed of two nearly separate sub-basins connected by the Strait of Tiquina, which is 800 m (2,620 ft) across at the narrowest point . The larger sub-basin, Lago Grande (also called Lago Chucuito), has a mean depth of 135 m (443 ft) and a maximum depth of 284 m (932 ft). The smaller sub-basin, Wiñaymarka (also called Lago Pequeño, "little lake"), has a mean depth of 9 m (30 ft) and a maximum depth of 40 m (131 ft). The overall average depth of the lake is 107 m (351 ft). </P> <P> Five major river systems feed into Lake Titicaca . In order of their relative flow volumes these are Ramis, Coata, Ilave, Huancané, and Suchez . More than twenty other smaller streams empty into Titicaca . The lake has 41 islands, some of which are densely populated . </P>

Where is lake titicaca located and what is special about it