Sister cities of Chios

Chios (/ˈkaɪ.ɒs/; Greek: Χίος, pronounced [ˈçios]; alternative transliterations Khíos and Híos; Turkish: Sakız Adası) 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 town. 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).