Headon Warren and West High Down is a 276.3 hectare Site of Special Scientific Interest (SSSI) located at the westernmost end of the Isle of Wight. The SSSI encompasses Headon Warren, a heather clad down to the north, the chalk downs of West High Down and Tennyson Down to the south, and the Needles, The Needles Batteries and Alum Bay to the west.