South West England development because of its environmental importance, which contributes to the region's attractiveness to tourists and residents. Geologically the region is divided into the largely igneous and metamorphic west and sedimentary east, the dividing line slightly to the west of the River Exe. Cornwall and West Devon's landscape is of rocky coastline and high moorland, notably at Bodmin Moor and Dartmoor. These are due to the granite and slate that underlie the area. The highest point of the region is High Willhays, at , on Dartmoor. In North Devon the slates of the west and limestones of the east meet at
High Willhays England south of Ingleborough in the Yorkshire Dales, but since then surveys have shown that Kinder Scout is also higher (albeit less prominent). The geology of High Willhays, like most of Dartmoor, consists of granite intruded about 280 million years ago. However High Willhays is in an area of the northern plateau of the moor where the exposed rock has noticeably fewer of the large feldspar megacrysts that are typical of most of Dartmoor's tors. Each of the outcrops displays lamellar bedding. High Willhays is within one of Dartmoor's Danger Zones, areas used periodically by the British Army for exercises.