While no Greek island is like another, Chios has one of the most distinctive faces, thanks to the unique fortress-like architecture of its villages that makes them look so different to their sugar-cube cousins on other islands. That style stems from the island's history as the ancestral home of shipping barons and the world's only commercial producer of mastic. Its varied terrain ranges from lonesome mountain crags in the north, to the citrus-grove estates of Kampos, near the island’s port capital in the centre, to the fertile Mastihohoria in the south, where generations of mastic growers have turned their villages into decorative art gems. The intriguing, little-visited satellite islands of Psara and Inousses share Chios’ legacy of maritime greatness. Chios (/ˈkaɪ.ɒs/; Greek: Χίος, Khíos, Greek pronunciation: [ˈçi.os]) is the fifth largest of the Greek islands, situated in the Aegean Sea, 7 kilometres (4.3 mi) off the Anatolian coast. The island is separated from Turkey by the Chios Strait. Chios is notable for its exports of mastic gum and its nickname is the Mastic Island. Tourist attractions include its medieval villages and the 11th-century monastery of Nea Moni, a UNESCO World Heritage Site. Administratively, the island forms a separate municipality within the Chios regional unit, which is part of the North Aegean region. The principal town of the island and seat of the municipality is Chios. Locals refer to Chios town as "Chora" ("Χώρα" literally means land or country, but usually refers to the capital or a settlement at the highest point of a Greek island). It was also the site of the Chios massacre in which tens of thousands of Greeks on the island were killed by Ottoman troops during the Greek War of Independence in 1822.