Sarnaz is a village in Devrek District, in Zonguldak Province, Türkiye. Sarnaz lies at 458 m above sea level, in the Akçakoca Dağları mountains. It has 135 inhabitants. The nearest city is Devrek, 15.1 km to the northeast. Among the landmarks around are Heraclea Pontica (41 km) and Köprübaşı Dam (15.1 km).