The North Norfolk Coast Site of Special Scientific Interest (SSSI) is an internationally important protected area in Norfolk, England. The SSSI is a long, narrow strip of coastal land that starts between Old Hunstanton and Holme-next-the-Sea, and runs east for about 43 km (27 mi) to Kelling. The southern boundary runs roughly west to east except where it detours around towns and villages, and never crosses the A149 coast road. It has an area of 7,700 ha (19,027 acres), and is additionally protected through Natura 2000, Special Protection Area (SPA) and Ramsar listings; it is also part of the Norfolk Coast Area of Outstanding Natural Beauty (AONB). Scolt Head Island and the coast from the Holkham National Nature Reserve to Salthouse are a Biosphere Reserve.