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
Cosdon Hill highest point at , but it was now known that the neighbouring High Willhays was yet higher, at . From the summit of Cosdon it is often possible to see the English Channel from Teignmouth to Start Point, and on a clear day the Bristol Channel may be visible. The hill provides an excellent view over Dartmoor. As Thomas Clifton Paris wrote in 1865, "Far and wide stretch its desolate hills, the ancient haunt of wolves and wild deer, and barbarians as untamed ; a solitary wondrous region, everywhere darkened by morasses, but piled with fantastic rocks and glowing with