The Barrage de Yalgo is the province of Namentenga’s most important reservoir in terms of its water capacity and contribution to the local economy. It is a unique inland wetland characterized by dense savannah vegetation dominated by trees including Balanites aegyptiaca, Acacia nilotica, Diospyros mespiliformis, Guiera senegalensis, Acacia pennata, Anogeissus leiocarpus and Mitragyna inermis. The wetland is home to different turtle species, the Nile crocodile, royal python, savannah monitor, goliath heron, hammerhead stork, African grey hornbill and the pied crow, which are threatened by hunting and loss of breeding areas. Fish commonly recorded in Yalgo include the Nile tilapia, catfish of the genus Clarias, and the West African lungfish Protopterus annectens. These are of a high nutritional and commercial value to the local communities. The main hydrological functions of the Yalgo include surface and groundwater supplies for wildlife, human consumption and irrigation.