Lake тιтicaca, the world’s highest lake navigable to large vessels, lying at 12,500 feet (3,810 metres) above sea level in the Andes Mountains of South America, astride the border between Peru to the west and Bolivia to the east. тιтicaca is the second largest lake of South America (after Maracaibo). It covers some 3,200 square miles (8,300 square km) and extends in a northwest-to-southeast direction for a distance of 120 miles (190 km). It is 50 miles (80 km) across at its widest point. A narrow strait, Tiquina, separates the lake into two bodies of water. The smaller, in the southeast, is called Lake Huiñaymarca in Bolivia and Lake Pequeño in Peru; the larger, in the northwest, is called Lake Chucuito in Bolivia and Lake Grande in Peru.
The meaning of the name тιтicaca is uncertain, but it has been variously translated as Rock of the Puma or Crag of Lead. тιтicaca lies between Andean ranges in a vast basin (about 22,400 square miles [58,000 square km] in area) that comprises most of the Altiplano (High Plateau) of the central Andes. In the snow-covered Cordillera Real on the northeastern (Bolivian) shore of the lake, some of the highest peaks in the Andes rise to heights of more than 21,000 feet (6,400 metres).
The lake averages between 460 and 600 feet (140 and 180 metres) in depth, but the bottom tilts sharply toward the Bolivian shore, reaching its greatest recorded depth of 920 feet (280 metres) off Isla Soto in the lake’s northeast corner.
More than 25 rivers empty their waters into тιтicaca; the largest, the Ramis, draining about two-fifths of the entire тιтicaca Basin, enters the northwestern corner of the lake. One small river, the Desaguadero, drains the lake at its southern end. This single outlet empties only 5 percent of the lake’s excess water; the rest is lost by evaporation under the fierce sun and strong winds of the dry Altiplano.
тιтicaca’s level fluctuates seasonally and over a cycle of years. During the rainy season (summer, from December to March) the level of the lake rises, normally to recede during the dry winter months. It was formerly believed that тιтicaca was slowly drying up, but modern studies have seemed to refute this, indicating a more or less regular cycle of rise and fall.
тιтicaca’s waters are limpid and only slightly brackish, with salinity ranging from 5.2 to 5.5 parts per 1,000. Surface temperatures average 56 °F (14 °C); from a thermocline at 66 feet (20 m) temperatures drop to 52 °F (11 °C) at the bottom. Analyses show measurable quanтιтies of sodium chloride, sodium sulfate, calcium sulfate, and magnesium sulfate in the water.
Lake тιтicaca’s fish life consists principally of two species of killifish (Orestias)—a small fish, usually striped or barred with black—and a catfish (Trichomycterus). In 1939, and subsequently, trout were introduced into тιтicaca. A large frog (Telmatobius), which may reach a length of nearly a foot, inhabits the shallower regions of the lake.
Forty-one islands, some of them densely populated, rise from тιтicaca’s waters. The largest, тιтicaca Island (Spanish: Isla de тιтicaca, also called Isla del Sol), lies just off the tip of the Copacabana Peninsula in Bolivia.
Ruins on the lake’s bottom (where the remains of a temple were discovered in 2000), on its shore, and on the islands attest to the previous existence of one of the oldest civilizations known in the Americas. The chief site is at Tiwanaku, Bolivia, at the southern end of the lake. On тιтicaca Island ruins of a temple mark the spot where, according to the tradition of the Incas (a Quechuan people of Peru who established an empire about 1100 ce), the legendary founders of the Inca dynasty, Manco Capac and Mama Ocllo, were sent down to Earth by the Sun.
