North Uist represents the tenth largest island in Scotland, being located in the Outer Hebrides. It has a surface of 303 square km (113 square mi), a little bit smaller than South Uist. It is linked by causeways to Benbecula via Grimsay, to Berneray, and to Baleshare. Without the south east, the North Uist is very plain, and roofed with a patchwork of peat bogs, reduced hills and lochans, with more than half the field being wrapped by water. A few lochs hold a blend of new and tidal salt water, giving birth to certain complex and uncommon habitats.