Chios is the fifth largest of the Greek islands, situated in the Aegean Sea, 4.3 mi off the Anatolian coast. The island is separated from Turkey by the Chios Strait. The island exports mastic gum. 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. Places of Interest: Nea Moni is a monastery with fine mosaics from Constantine IX's reign and a World Heritage Site, Castle of Chios, Chios Byzantine Museum, Archaeological Museum of Chios, the town of Vrontados is home to a unique Easter celebration, where competing teams of locals gather at the town's two (rival) churches to fire tens of thousands of homemade rockets at the other church's bell tower while the Easter service is going on inside the churches, in what has become known as rouketopolemos ("the Easter church war"), there is reportedly a "small country church" on Chios that has a family memorial which lists 14 generations of a family, starting at the fifth century BC and going back to the tenth century BC, before there were any written records in Greece.