Onüç Eylül is a neighborhood in Soma District, in Manisa Province, Türkiye. Onüç Eylül lies 0.5 km from the Yunt mountains. It has 6,210 inhabitants. The nearest city is Soma, 1.5 km to the southwest. Among the landmarks around are Pergamon (38 km), Stratonicea (17.0 km) and Sevişler Dam (9.5 km).