Ulupınar is a village in Durağan District, in Sinop Province, Türkiye. Ulupınar lies at 594 m above sea level, in the Küre mountains. It has 178 inhabitants. The nearest city is Vezirköprü, 19.4 km to the southeast. Among the landmarks around are Nerik (12.4 km) and Vezirköprü Dam (16.2 km).