Tunisia is situated on the Mediterranean coast of North Africa, midway between the Atlantic Ocean and the Nile Delta. It is bordered by Algeria on the west and Libya on the south east. An abrupt southward turn of the Mediterranean coast in northern Tunisia gives the country two distinctive Mediterranean coasts, west-east in the north, and north-south in the east. Tunisia's climate is temperate in the north, with mild rainy winters and hot, dry summers. The south of the country is desert. In the north there is mountainous terrain, which, moving south, gives way to a hot, dry central plain. The south is semi-arid, and merges into the Sahara. A series of salt lakes, known as chotts or shatts, lie in an east-west line at the northern edge of the Sahara and extends from the Gulf of Gabes into Algeria. The lowest point, Shatt al Gharsah, is 17 metres (56 ft) below sea level and the highest is Jebel ech Chambi, at 1,544 metres (5,066 ft).