The Adrar Tamgak is located in the north-east of the Aïr and is part of the UNESCO World Heritage Aïr and Ténéré Nature Reserve. The mountain massif is divided into a northern and a southern section by a deep, arching gorge running in a west-east direction. The western entrance to the gorge is around five kilometres from the village of Iférouane. Its eastern exit leads into the sand dunes of the Ténéré desert to the south-west of the Chiriet massif. Underground water flows to the surface at the side gorges, creating large pools of water, especially in the western part. The dry valley running through the gorge is the Tamgak, with the Toufouchi and the Zakkat as important tributaries. - Tamgak - Aïr - Niger - 2001