Union of Bosphorus Municipalities was established in 2001 as a “union” within the scope of the Municipalities Law No. 1580 and consists of Istanbul Metropolitan Municipality, Beyoğlu Municipality, Beşiktaş Municipality, Fatih Municipality, Sarıyer Municipality, Beykoz Municipality and Üsküdar Municipality. Each municipality elects 2 full and 2 substitute council members in its own assembly, who are appointed as Union Council Members.

The Union was established in 2001 with the aim of preserving the historical and natural beauties of the Bosphorus and transferring them to future generations. The Union, which strives to protect and preserve all values specific to the Bosphorus, envisages cooperation on issues such as the architectural texture of the Bosphorus, the zoning status, the protection of the diversity of life in the Bosphorus waters, the organization of touristic, cultural and sports activities, and the coordination of transportation facilities.

Its Mission and Vision is to preserve the historical and natural beauty of the Bosphorus and to ensure that it reaches future generations and to be a leading association that seeks quality in management and is a pioneer in change.