The Norwegian Boundary Sediment Plain is a Marine Protected Area (MPA) lying to the northeast of Scotland. The MPA, which covers 164 km² (63 sq mi), lies at the very edge of Scottish offshore waters, close to the maritime boundary with Norway.^[1] The seabed of the sediment plain consists of sand and gravel habitats, and lies at a depth of between 80 and 120 metres below sea level.^[2] The sea bed supports creatures such as starfish, crabs and ocean quahogs. The latter, which are large and slow growing clams, have a lifespan of more than 400 years and are thus considered to be amongst the oldest living animals on Earth.^[3]