High Quality Content by WIKIPEDIA articles! Soay lies some 40 miles (64 km) west-northwest of North Uist in the North Atlantic It is about 2 kilometres (1.2 mi) north-west of Hirta, from which it is separated by the narrow Sound of Soay. Two sea stacks, Stac Shoaigh (Soay Stac 61 metres (200 ft)) and Stac Biorach (73 metres (240 ft)) lie between. Soay covers about 96.8 hectare and reaches a height of 378 metres (1,240 ft), the cliffs rising sheer from the sea. The island is formed of a breccia of gabbro and dolerites. It is formed as a single mountain peak rising from the sea-bed, without Ice-Age erosion.