Arsin is a municipality and district of Trabzon Province, Turkey. Its area is 157 km², and its population is 30,911. It is on the Black Sea coast, ea…Arsin is a municipality and district of Trabzon Province, Turkey. Its area is 157 km², and its population is 30,911. It is on the Black Sea coast, east of the city of Trabzon. The mayor is Hamza Bilgin, a member of YRP.