Doğan is a neighborhood in İzmit District, in Kocaeli Province, Türkiye. Doğan lies in the Akçakoca Dağları mountains. It has 4,457 inhabitants (2022). The nearest city is Derince, 4.0 km to the west. Among the landmarks around are Nicomedia (3.5 km), Astacus (7.4 km) and Nicaea (40 km).
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