The Orkneys is an archipelago in northern Scotland, situated 10 miles (16 km) north of the coast of Caithness. Orkney comprises over 70 islands; around 20 are inhabited. The largest island, known as "Mainland," has an area of 202 sq mi (523 km²), making it the sixth-largest Scottish island and the tenth-largest island in the British Isles. The largest settlement and administrative centre is Kirkwall