Egypt, lies at the northeast corner of Africa at the junction of four biogeographical regions, Irano-Turanian, Mediterranean, Saharo-Sindian and Afrotropical. At the same time it is at the center of the great Saharo-Sindian desert belt that runs from Morocco on the northwest corner of Africa to the high, cold deserts of central Asia. Egypt is bounded on the north and east by two largely enclosed seas, the Mediterranean Sea and the Red Sea. This unique position is enhanced by the circumstance that it is divided by the Nile, the longest river in the world. Most of Egypt is either arid or hyper arid; however, due to its very varied eco-zones, the country is home to a wide diversity of terrestrial habitats and a fauna and flora, which although relatively low in species numbers and with few endemics, is extremely varied in composition.