highland range that for more than 30 miles (50 km) marks the boundary between England and Scotland. In the east a great pile of ancient volcanic rocks reaches an elevation of 2,676 feet (816 metres) in the Cheviot. The hills are steep but smoothly rounded; they are dissected by deep glens almost deserted except for a few shepherds' cottages. Evidence of prehistoric occupation is widespread. Farther west the lower hills of shale and sandstone, heavily coated with glacial drift, form peaty moorlands that have been extensively afforested since World War II. The land controlled by the Forestry Commission is a National Forest Park, and an even larger area lies within the Northumberland National Park.