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Mills Rocks is one of 67 Sites of Special Scientific Interest in West Sussex. At 0.02 km², it is one of the smaller SSSIs in the county. The surrounding countryside is part of the High Weald National Landscape.
The nearest railway station is East Grinstead, about 2.8 km to the north-west. Nearby SSSIs include Weir Wood Reservoir, Ashdown Forest and Stone Hill Rocks.