Exmoor has of coastline, including the highest cliffs in England, which reach a height of at Culbone Hill. However, the crest of this coastal ridge of hills is more than from the sea. If a cliff is defined as having a slope greater than 60 degrees, the highest cliff on mainland Britain is Great Hangman near Combe Martin at high, with a cliff face of . Its sister cliff is the Little Hangman, which marks the edge of Exmoor.