 Exmoor has 55 kilometres (34 mi) of coastline. The highest sea cliff on mainland Britain (if a cliff is defined as having a slope greater than 60 degrees) is Great Hangman near Combe Martin at 318 metres (1,043 ft) high, with a cliff face of 250 metres (820 ft). Its sister cliff is the 250 metres (820 ft) Little Hangman, which marks the edge of Exmoor. The coastal hills reach a maximum height of 314 metres (1,030 ft) at Culbone Hill.
