Tílos Island is located in the Aegean Sea (Eastern Mediterranean) and is part of Greece's Dodecanese islands. Tílos is located midway between the islands Kos and Rhodes and has a population of under 1,000. Along with two uninhabited isles (Antitilos and Gaidaros), Tílos forms a municipality with a total area of approx 65 km2 (25 mi2), which is part of Rhodes regional unit.
The island is shaped as inverted S, has a length of approx 15 km (9 mi / northwest-southeast), max width 8 km (5 mi) and land area approx 61 km2 (24 mi2). The landscape is similar to Nisyros - mountainous (limestone), with red lava sand, springs, fertile meadows, rocky or pebbled coast with several sand beaches.
During its history, the island was ruled by the Byzantine Empire (395-1453), Crusaders (Knights of Saint John, 1309-1470), the Ottoman Empire (1299-1922, in the period 1523-1912). In June 2008, the island's mayor performed Greece's first same-sex marriage.
Island's best-known tourist attractions include Ayios Pandeleímon Monastery, Megalo Chorio ruins (medieval castle / Fortress of Mesaria), Livadhia (principal port harbour and island's economic centre), Mikro Chorio (15th-century town built by Knights of St John), castles (Megalo and Mikro Chorio, Mesaria, Agrosikia, Stavrou Lambrou).