Lac Debo

Lake Débo
Mud houses on the center island at Lake Débo
Coordinates	15°19′0″N 4°6′0″W / 15.31667°N 4.10000°W / 15.31667; -4.10000Coordinates: 15°19′0″N 4°6′0″W / 15.31667°N 4.10000°W / 15.31667; -4.10000
Primary inflows	Niger River
Primary outflows	Niger River
Basin countries	Mali
Surface area	160 km2 (62 sq mi)

Lake Débo is a lake in the central part of Mali, formed by the seasonal flooding of the Niger River basin. It is in the Inner Niger Delta of the Niger River. During high water stages of the river, the delta formed by lakes, creeks, and backwaters form part of Lake Débo. The inner delta has many wide channels, which are shallow and flooded marshes; this delta extends over a length of 320 kilometres (200 miles) with a width of 80 km (50 mi). Lake Débo during high flow season, is at a distance of 80 km (50 mi) from Mopti on its upstream, on the southern end and 240 km (150 mi) from Timbuktu at its downstream, on the north-eastern end. It is the largest of many such seasonal wetlands and lakes which form the Inner Niger Delta, and the largest lake within Mali. Its size is largely reduced during the dry season of September to March. The existence of this lake called the "Great Lake" in the inner delta of Niger River between Jenne and Timbuktu in Mali has been established after extensive study of maps of the region extending over a period from 1000 to 1900 AD; 400 maps were studied for the period.

This lake, called the "Great Lake" in the inner delta of Niger River between Jenne and Timbuktu in Mali, was known to Europeans from very early times. The earliest known report of it was in the first millennium BC. Ptolemy described it as having the shape of a barbell. Study of more than 400 maps of the region created over a period from 1000 to 1900 AD found that the lake appeared on 95 percent; the only feature depicted on more maps was the Nile. The lake has been known variously as Nigrite Palus, Lake Sigisma, Lake Guber, Lake Guarda, Bog/Morais of Guarda, Lake Maberia, Bahar Seafeena, Lake Dibbie, but it is now known as Lake Débo. The Niger River is assessed as a young river of 2000 years age and is yet to stabilize. However, the natural channels have undergone many meandering changes.