Avdan is a neighborhood in Keles District, in Bursa Province, Türkiye. Avdan lies at 872 m above sea level, in the Anatolian plateau mountains. It has 110 inhabitants. The nearest city is Tavşanlı, 36 km to the southeast. Among the landmarks around are Hadriani ad Olympum (23 km) and Büyükorhan Dam (25 km).
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