Mestan is a village in Ayancık District, in Sinop Province, Türkiye. Mestan lies at 444 m above sea level, in the Küre mountains. It has 98 inhabitants. The nearest city is Boyabat, 49 km to the southeast. Beaches nearby: Ayancık (11 km), Ayancık Köyü (12 km), Ali Köyü (14 km).