The wildlife of Saudi Arabia is substantial and varied. Saudi Arabia is a very large country forming the biggest part of the Arabian Peninsula. It has several geographic regions, each with a diversity of plants and animals adapted to their own particular habitats. The country has several extensive mountain ranges, deserts, highlands, steppes, hills, wadis, volcanic areas, lakes and over 1300 islands. The Saudi Arabian coastline has a combined length of 2,640 km (1,640 mi) and consists of the Gulf of Aqaba and the Red Sea to the west while a shorter eastern coastline can be found along the Persian Gulf.