The last of the three national parks, formed in 1957, the park straddles the divide between rural mid Wales and industrial South Wales. It stretches from Llandeilo in the west to Hay-on-Wye in the northeast and Pontypool in the southeast, covering 519 square miles (1,340 km2) and encompassing four main regions – the Black Mountain in the west, Fforest Fawr and the Brecon Beacons in the centre, and the confusingly named Black Mountains in the east, where the highest point is Waun Fach 811 metres (2,661 feet).