Büyükçekmece, historically Athyras (Greek: Αθύρας) is a municipality and district of Istanbul Province, Turkey. Its area is 173 km2, and its population is 277,181 (2022). It is on the Sea of Marmara coast of the European side, west of the city. It is largely an industrial area. The mayor is Dr.Hasan AKGÜN (CHP).
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