Tanera Mòr is the largest island, and has been uninhabited since 2014. It was formerly home to an Atlantic salmonfish farm, some rental holiday homes, a café and a post office, which operated its own local post and printed its own stamps since 1970 until 2013, but a new set is planned for 2016. The island has no roads and the only recognisable path goes around the Anchorage, the sheltered bay on the east side of the island. Boats sail to the island from Achiltibuie and Ullapool.
Frank Fraser Darling, an important figure in the development of Scottish conservation, lived on Tanera Mòr for two years in the 1930s. His book, Island Years (published 1940), records his time in the Summer Isles, painting Priest Island as a place of great beauty as well as great wildlife.