Papa Stour is one of the Shetland Islands in Scotland, with a population of under twenty people, some of whom immigrated after an appeal for residents in the 1970s. Located to the west of mainland Shetland and with an area of 828 hectares (3.2 square miles), Papa Stour is the eighth largest island in Shetland. Erosion of the soft volcanic rocks by the sea has created an extraordinary variety of caves, stacks, arches, blowholes, and cliffs. The island and its surrounding seas harbour diverse populations of wildlife.