Leith Hill in southern England is the highest summit of the Greensand Ridge, approximately 6.7 km (4 mi) southwest of Dorking, Surrey and 40.5 km (30 mi) southwest of central London. It reaches 294 m (965 ft) above sea level, and is the second highest point in southeast England, after Walbury Hill in southwest Berkshire,. Leith Hill is the highest ground for 79 km (49 mi).

The Greensand Ridge, also known as the Wealden Greensand, is an extensive, prominent, often wooded, mixed greensand/sandstone escarpment in south-east England. Forming part of the Weald, a former dense forest in Sussex, Surrey and Kent, it runs to and from the East Sussex coast, wrapping around the High Weald and Low Weald. It reaches its highest elevation, 294 metres (965 ft), at Leith Hill in Surrey—the second highest point in south-east England, while another hill in its range, Blackdown, is the highest point in Sussex at 280 metres (919 ft). The eastern end of the ridge forms the northern boundary of Romney Marsh.