Derebaşı is a neighborhood in Nazilli District, in Aydın Province, Türkiye. Derebaşı lies at 743 m above sea level, in the Aydin mountains. It has 492 inhabitants. The nearest city is Nazilli, 23 km to the south. Among the landmarks around are Sardis (50 km), Aphrodisias (55 km) and Mastaura (18.6 km).