Bayamca is a village in Boyabat District, in Sinop Province, Türkiye. Bayamca lies at 705 m above sea level, in the Küre mountains. It has 370 inhabitants. The nearest city is Boyabat, 14.2 km to the south. Among the landmarks around are Boyabat Castle (13.8 km) and Dodurga Dam (18.8 km).