Avdan is a village in Osmaneli District, in Bilecik Province, Türkiye. Avdan lies at 461 m above sea level, in the Katırlı Dağları mountains. It has 165 inhabitants. The nearest city is İznik, 11.4 km to the northwest. Among the landmarks around are Nicaea (11.5 km), Green Mosque (11.0 km) and Xerigordos (3.4 km).
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