Abdera (/əbˈdɪrə/; Ancient Greek: Ἄβδηρα) was a major Greek polis on the coast of Thrace. It lay 17 km east-northeast of the mouth of the Nestos River, almost directly opposite the island of Thasos. The site now lies in the Xanthi regional unit of Thrace, Greece. The municipality of Abdera (Modern Greek: Άβδηρα [ˈavðira]) has 19,005 inhabitants (2011). The seat of the municipality is the town Genisea.