 Dunstanburgh Castle occupies a 68-acre (27.5 ha) site within a larger 610-acre (246 ha) body of National Trust land along the coast.The castle is situated on a prominent headland, part of the Great Whin Sill geological formation.On the south side of the castle there is a gentle slope across low-lying, boggy ground, but along the northern side, the Gull Crag cliffs form a natural barrier up to high.