Doğuca is a village in Boyabat District, in Sinop Province, Türkiye. Doğuca lies at 559 m above sea level, in the Ilgaz mountains. It has 197 inhabitants. The nearest city is Boyabat, 6.2 km to the northwest. Among the landmarks around are Boyabat Castle (7.3 km), Boyabat Dam (18.1 km) and Saraydüzü Dam (11.1 km).