North and South Uist are linked by causeways running via Benbecula and Grimsay. A paradise for walkers, these tranquil islands abound in geological and historical contrasts. The low-lying bird-haven of North Uist, scattered with green-blue lochans, is Norse and Protestant by tradition, and a world apart from the Catholic and Gaelic stronghold of South Uist. The second-largest of the Outer Isles, South Uist’s softer, undulating landscape is carpeted in flower-decked machair and fringed by dunes.