The city was famous in its day for the nearby Temple of Artemis (completed around 550 BC), which has been designated one of the Seven Wonders of the Ancient World.[7] Its many monumental buildings included the Library of Celsus and a theatre capable of holding 24,000 spectators.[

Didim is located on the north shore of the gulf of Güllük, opposite Bodrum peninsula villages such as Torba, Türkbükü, and Yalıkavak. In antiquity, this formed the Posideium Peninsula but silt from the Meander River has since filled in the inlet to its north, connecting it more thoroughly to the mainland.

The settlement of Doğanbey is located in the area of the Dilek Peninsula-Büyük Menderes Delta National Park, on a hill on the southern side of the peninsula. This old village was once inhabited by the Greek community and, until the population exchange between Greece in Turkey in 1924, was called Domatia.