Apollonia or Apollonia-on-the-Rhyndacus (Ancient Greek: Ἀπολλωνία ἐπὶ Ῥυνδακῷ, Apollōnía épì Ryndakō; Latin: Apollonia ad Rhyndacum) was an ancient town opposite the delta of the Rhyndacus river in northwestern Anatolia and corresponds today to the town of Gölyazı.

[2] Lake Uluabat extends from east to west and is studded with several islands and peninsulas, on one of which the city of Apollonia was built.

Apollonia ad Rhyndacum is one of many ancient Greek cities that bear the name of Apollo.

The city experienced prosperity under the Attalids during Hellenistic times.It is thought that the neighbouring islet known today as Kız Ada was a sacred area of Apollo during antiquity.

Usage of crawfish figure continued its prevalence while depiction of Gorgon head gradually decreased.

Aybek S. and Öz A. K. “Preliminary Report of the Archeological Survey at Apollonia Ad Rhyndacum”, Anatolia 27, 1-25, 2004.