The large, shallow and brackish Kokoro wetland lies in an ancient valley surrounded by sand-dunes, granite outcrops and flat-topped hills. At one time, the valley may have drained into the
Niger River to the northeast, but it now has no outlet. The wetland contains water from 7–12 months of each year, and at times is 13 km long and 2,100 ha in area. Rainfall varies greatly from year to year. At the western end there is a tree-covered flood-plain. The wetland is an important ecological zone on the African-Eurasian flyway, and has been designated a Ramsar site. Although government-owned, it may be used by the local population under supervision. The wetland is used heavily for cattle grazing in the dry season, which may be damaging the plant life. It was stocked with fish in 1986, but the only surviving species is the lungfish
Protopterus annectens, which caught with nets and lines by the local people. Sand dunes threaten the northern border of the wetland, and have been the target of a dune-fixation program. == Settlements ==