It extends into Devon but the majority of the area is in Somerset .
Exmoor is a dissected plateau of Devonian sedimentary rock , rising to 517 metres ( 1,696 ft ) at Dunkery Beacon .
Exmoor extends into Devon but the majority of the area is in Somerset .
Exmoor is a dissected plateau of Devonian sedimentary rock , rising to 517 metres ( 1,696 ft ) at Dunkery Beacon .