Eritrea is located in the Horn of Africa and is bordered on the northeast and east by the Red Sea, on the west and northwest by Sudan, on the south by Ethiopia, and on the southeast by Djibouti. Eritrea boasts part of the Afar Triangle, also known as the Afar Depression, which is one of the hottest places on earth.
The Afar Triangle (also called the Afar Depression) is a geological depression caused by the Afar Triple Junction, which is part of the Great Rift Valley in East Africa. The Depression overlaps the borders of Eritrea, Djibouti and the entire Afar Region of Ethiopia; and it contains the lowest point in Africa, Lake Asal, Djibouti, at 155 m (or 509 ft) below sea level.
Source: https://en.wikipedia.org/wiki/Afar_Triangle, https://en.wikipedia.org/wiki/Geography_of_Eritrea