Island group in the Norht Atlantic, off the west coast of Scotland: Lewis and Harris, South Uist, North Uist, Benbecula, Barra, Scalpay, Great Bernera, Grimsay, Berneray, Eriskay, Vatersay. 

The islands are very diverse in character. Lewis is flat, Harris is mountainous, Uist is flat again. It's a birders paradise. Long continuous trails are missing. But on the other hand the islands are relatively isolated to the main car driven tourist industry. Backpacking and hopping from one island to the other is a good idea.