The Small Isles are a group of Islands 8 to 10 miles south of Skye. They consist of Rùm, Eigg, Canna and Muck, all of which are visible from many parts of Strathaird and Sleat, weather permitting. A ferry from Armadale in Sleat, serves the islands and, since the route is circular, day trips are possible. Additionally some boats offer private charter trips to and around the islands by arrangement. Rum is the largest of the small isles, at over 100 square kilometres, and much more mountainous than its neighbours. Canna is the most westerly island of the group and has been a bird sanctuary since 1938 with 157 different species of birds. The second largest of the group, Eigg, has a distinctive outline provided by a sloping ridge of lava known as the Sgurr that runs down the island. Despite being the smallest and flattest of the Small Isles, there is a great deal to do and see on Muck.