Saturna Island is a mountainous island, about 31 km² (12 sq. miles) in size, in the Southern Gulf Islands chain of British Columbia. It is situated approximately midway between the Lower Mainland of B.C. and Vancouver Island, and is the most easterly of the Gulf Islands. It is surrounded on three sides by the Canada/USA border. To the north is Point Roberts, Washington, and to the east and south are the San Juan Islands. Saturna has a permanent population of around 350, although that number increases significantly during the busy summer season.