North Uist represents the tenth largest island in Scotland, being located in the Outer Hebrides. It presents 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.