The North Devon Coast AONB covers of mainly coastal landscape from the border of Exmoor National Park at Combe Martin, through the mouth of the Taw & Torridge Estuary to the Cornish border at Marsland Mouth. The dune system at Braunton Burrows forms the core area of North Devon's Biosphere Reserve, the first new style Unesco-designated reserve in the United Kingdom. The whole of the AONB is within the Reserve boundaries.