Lake Poopó, normally a large, marsh-fringed salt lake, is featured in this west-looking, low-oblique photograph. Located on the Andean altiplano at more than 12 000 feet (3660 meters) above sea level, the lake—normally no more than 10 feet (3 meters) deep and 1150 square miles (3000 square kilometers) in area—has experienced decreasing water levels since the early 1990s. The lake lies at the lower end of a surface drainage system, the Desaguadero River that starts at Lake Titicaca to the north, whose levels have also been receding. Lake Poopó drains to the west into Salar de Coipasa, a salt basin.