Beçin is located 5 km South of the Milas District, in the Muğla Province, southwest of Turkey.
The city hosted many civilizations during the Geometric, Archaic, Classical periods, and also hosted the Romans, Byzantines, Menteşeoğulları Sultanate and Ottomans. However, it was not a prominent city in ancient times or during the Byzantine period. It has become prominent in the second half of the 13th century, especially while it was the capital city of the Menteşeoğulları Sultanate which existed more than 200 years. Menteşeoğulları dominated an area in western-Anatolia including Muğla, Balat, Milas, Beçin, Çine, Tavas and Köycegiz.