Except for some scattered oases, these deserts are uninhabited. The east is an arid plateau irrigated by oases and seasonal water streams. The desert features a striking diversity of landscapes including mountains, oases, and sand seas. There is evidence of petroglyphs along the Nile terraces and in desert oases. Little is known about the old farming communities in the oases, river valleys, and wetlands. There are four main oases in the Egyptian desert. All of its kings reigned in Middle and Upper Egypt including the Western Desert Oases. They live either as herders and nomads or as farmers near oases. Menkheperre then exiled the leaders of the rebellion to the Western Desert Oases. Irrigation systems were established along the northern coastline and around various inland oases. The list includes cities, towns, villages, oases and other settlements. There are agricultural settlements along the rivers and in the oases. The Libyan Desert is home to a few oases, including Awjila (ancient Augila) and Jaghbub. It is one of the most heavily irrigated oases in the Sahara. Rain showers provide subterranean water to sustain natural oases, such as the Tuat.