Seyisoğlu is a village in Devrek District, in Zonguldak Province, Türkiye. Seyisoğlu lies at 332 m above sea level, in the Akçakoca Dağları mountains. It has 300 inhabitants. The nearest city is Devrek, 10.0 km to the northeast. Among the landmarks around are Heraclea Pontica (39 km), Kızılcapınar Dam (21 km) and Köprübaşı Dam (21 km).
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