Troubridge Island is a fragile sand island about 8 km offshore from Edithburgh, protected as a conservation park and known for its lighthouse, seabirds, and sense of isolation. The red-and-white lighthouse is decommissioned now, but it still gives the island its character.
Access is controlled because of the nesting birds and the sensitive island environment. You need a permit or a guided arrangement, so this is not a casual drop-in beach. If you can line it up, though, it is the most distinctive outing from Edithburgh: low dunes, open water, heritage cottages, and the feeling of being much farther from the mainland than you are.