Few frontiers are more spectacular than that between Zimbabwe and Mozambique which has a great mountain escarpment running, more or less, north-south. Two great rivers, the Zambezi and the Limpopo, have worn a way to the sea through the plateau-land, so that the Zimbabwean central plateau stretches from east to west and is bounded to north and south by the Zambezi valley and lowveld through which the two rivers run. Two other rivers, the Sabi and Ruenya, complicate the terrain by cutting deep valleys through this mountainous escarpment forming the eastern border of Zimbabwe. The Sabi, flowing southwards and then eastwards, isolates the district of Melsetter from the main plateau. North of Mutare, the Nuagadzi on its way to join the Zambezi in Portuguese territory, isolates the high ground of Nyanga, where a type of scenery covering some 3,000 square miles exists that is nowhere else seen in Zimbabwe. These mountains form part of a larger mountain chain that runs through Africa, from the Ethiopian highlands to the Drakensberg Mountains in South Africa. They consist of a complex mosaic of forests, woodlands, and grasslands. The fauna also shows affinities to the mountains of these areas, although several endemic animals are found here as well. The characteristic rainy and foggy climate makes this region suitable for coffee, tea, and dairy farming as well as exotic timber plantations. However, the hilly and inaccessible nature of these mountains has preserved native vegetation, as has the large Chimanimani National Park.