The
Greensand Ridge is an extensive, prominent, often wooded, mixed
greensand/
sandstone escarpment in south-east England. It runs to and from the
East Sussex coast, around
the Weald, a former dense forest in Sussex, Surrey and Kent. It reaches its highest elevation, , 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 . The eastern end of the ridge forms the northern boundary of
Romney Marsh.