Gighay lies in the Sound of Barra between Barra and Eriskay, 2+1⁄2 miles (4 kilometres) southwest of Fuday. One of a string of islands between South Uist and Barra, Gighay is "locked" into its neighbour Hellisay, with a harbour between. It is mainly gneiss with quartz veins.[3] Gighay has an area of 96 hectares (240 acres) and rises steeply to 95 metres (312 feet).