Tigray Province
Tigray (, ) is a historical region and province of Ethiopia. It encompasses most of the territories of Tigrinya-speakers (and a few minority groups closely linked with them) in Ethiopia; Tigray is separated from the northern Tigrinya territories by the River Mereb, now serving as the state border to Eritrea.
Tibesti Region
The Tibesti Region is located in the Sahara. It contains part of the Tibesti Mountains, and part of the Erg of Bilma, a vast area of sand dunes in the center of the desert. The region's northern border lies on the Aouzou Strip, a point of dispute between Chad and Libya. The region also shares a border with Niger. The capital, Bardaï, is located in the northern part of the region.