The border starts in the north at the tripoint with Egypt on Gabal El Uweinat, proceeding south along the 25th meridian east for 223 km (138 mi) down to the 20th parallel north. It then turns west along this parallel for 105 km (65 mi), before turning south at the 24th meridian east, where it turns south, running for 56 km (35 mi) down to the tripoint with Chad. The entire border runs through a remote, scarcely inhabited section of the Sahara desert.[2]