The large surface of Chad (1.3 million km 2 ) as well as desertic to semi-desertic climate on the majority of its area, makes this country a potentially prolific place to identify impact craters as discussed in a recent review [1], following the one of [2]. Besides the two proven circa 15-20 km diameter eroded structures, Aorounga and Gweni-Fada, a number of potential impact structures have also been proposed (table andfigure below). The most promising ones are Faya, Iro lake and Mousso structures, with diameters of 2, 13 and 3.5 km, respectively. Other previously proposed structures (Oun and Uri), near the Libyan border, are most probably of magmatic origin. Based on geomorphological and geological arguments Iro lake geomorphology cannot be readily explained by another process than impact and its investigation should be a priority based on its size and potential interest as a paleoclimatic recorder. We also put forward a 31 km diameter structure named Ehi Gidaha, possibly buried under the Devonian sandstones from south Tibesti. Except Iro lake, all proven or potential structures are located in the Paleozoic (Carboniferous and older) sedimentary formations of Sahara, covering about 8 10 4 km 2 . The four post-Carboniferous proven or promising structures from Sahara lack age constrains. However, the large density of structures suggests ages of the order of hundreds of Ma, in line with the extremely low erosion rate of the area and the fact that these structures are affected by regional joints of likely Tertiary age. [1] also report about meteorites (4 falls and 2 finds) recovered in Chad.