Karahisar (formerly: Karaasar) is a neighbourhood of the municipality and district of Tavas, Denizli Province, Turkey.

[4][5] It is situated along the Akçay creek, a tributary of Büyükmenderes River (historical Maeander).

The earlier name of the settlement Karaasar probably refers to Kara Fatma, the wife of the tribe.

Gülfem one of the concubines of Suleyman I, the Ottoman sultan (also called the Magnificent) commissioned a mosque and a fountain in the settlement.

This geographical article about a location in Denizli Province, Turkey is a stub.