Boyabat is a town and district of Sinop Province in the Black Sea region of Turkey. The mayor is Mehmet Ermiş (AKP). Boyabat has a population of 50,000 in the town itself. The town is in the Gökırmak ("blue river") valley, a river valley parallel to the Black Sea coast, located 100 km south of Sinop over the coastal mountain range, .