Karahallı is a neighborhood in Nazilli District, in Aydın Province, Türkiye. Karahallı lies at 544 m above sea level, in the Aydin mountains. It has 525 inhabitants. The nearest city is Nazilli, 19.8 km to the south. Among the landmarks around are Aphrodisias (51 km), Sardis (54 km) and Nysa on the Maeander (29 km).