Lake Guidimouni is located in the rural commune of Damagaram-Takaya in the Zinder Region, which receives low and unreliable annual rainfall. It is a permanent lake as it lies in a significant depression that is continuously filled by groundwater sources as well as surface water. The Lake is surrounded by trees and shrubs, dominated by date palm Phoenix dactilifera and trees including Acacia nilotica, Faidherbia albida and Balanites aegyptiaca. The water body, however, is dominated by the invasive herbaceous plant Typha domingensis. Prominent among the Lake’s fauna are migratory and sedentary waterbirds such as the white stork Ciconia ciconia, the grey heron Ardea cinerea, the western cattle egret Bubulcus ibis and the little egret Egretta garzetta. Reptiles such as Crocodylus niloticus and the rock monitor Varanus albigularis, and the near-threatened patas monkey Erythrocebus patas, are also present. Over-exploitation of resources by the local communities, and variability in precipitation and temperature patterns across the Sahel region, are the main threats to the Lake’s water quality and biodiversity.