Surrey Hills is a an area of countryside in England that has been designated for conservation due to its significant landscape value. The highest summit of the Surrey Hills is Leith Hill near Coldharbour, which is 294 meters (965 ft) above sea level. It is part of the Greensand Ridge, which traverses the area from west to east, and is the highest point in southeast England. The Surrey Hills area has three long-distance walks running through it: the North Downs Way, the Greensand Way and the Pilgrims' Way. Blackheath Common is also part of this area. The northern ridge of these hills, predominantly formed by chalk, is separated by the Vale of Holmesdale which continues into Kent from the southern ridges which are predominantly greensand. They provide a haven for rare plants and insects.