St Agnes Island (Aganas) is the southernmost of Isles of Scilly, with population under 100. Troy Town Farm on St Agnes is UK's southernmost settlement. St Agnes Island joins Gugh island by a sandbar (named Gugh Bar), which is exposed only at low tide. Gugh Island is practically inhabited. Gugh and Aganas have combined land area of 148 hectares (366 acres).
Cruise ships to Aganas dock/anchor at Troy Town Farm - port town on the island's western coast.
More than 1/3 of St Agnes Island's area is designated SSSI (Site of Special Scientific Interest). In the south, Wingletang Down is famous for its rocky coast and dune grassland. It is the only place in the UK where Ophioglossum lusitanicum (fern least adder's–tongue) grows. Other rare plants include Spiranthes spiralis (orchid autumn lady’s-tresses) and Poa infirma (early meadow-grass). The only freshwater pools on the island are named Big Pool and Little Pool.
In earlier times, many men from St Agnes Island were employed as maritime pilots, assisting navigation of Transatlantic ocean liners and cargo ships through the English Channel. Today, the island's economy is based on tourism and bulb farming.
Accommodation is limited - St Agnes is the only populated in Scilly Islands that has no hotel. Instead, it offers self-catering cottages and B&Bs, post office, general store, camping site, ice cream shop, gift shop, pub (called Turk's Head), cafe restaurant. Most of these are closed in winter months.
Island's most notable landmark is the lighthouse. It is converted into living accommodation and its tower no longer has a light. Other landmarks include Nag's Head (standing stone, natural formation) and Troytown Maze (pebble maze built during medieval times).