Beykoz is a district in Istanbul, Turkey at the northern end of the Bosphorus on the Anatolian side. Beykoz includes everything from the streams of Küçüksu and Göksu (just before Anadolu Hisari) up to the opening of the Bosphorus into the Black Sea, and the villages in the hinterland as far as the river of Riva. This is one of the most pleasant and peaceful districts of Istanbul, with much greenery still intact. The mayor is Yücel Çelikbilek (AKP).