The city lies at an elevation of  above sea level. It lies on north–south trending highlands known as the Eritrean Highlands, an extension of the Ethiopian Highlands. The temperate central portion, where Asmera lies, is situated on a rocky highland plateau, which separates the western lowlands from the eastern coastal plains. The lands that surround Asmera are very fertile, especially those to the south towards the Debub Region of Eritrea. The highlands that Asmera is located in fall away to reveal the eastern lowlands, characterized by the searing heat and humidity of the Eritrean salt pans, lapped by the Red Sea. To the west of the plateau stretches a vast semi-arid hilly terrain continuing all the way towards the border with Sudan through the Gash-Barka Region.