Beykoz, also known as Beicos and Beikos, is a district in Istanbul, Turkey at the northern end of the Bosphorus on the Anatolian side. The name is believed to be a combination of the words bey and kos, which means “village” in Farsi. Beykoz includes an area from the streams of Küçüksu and Göksu (just before Anadoluhisarı) to the opening of the Bosphorus into the Black Sea, and the villages in the hinterland as far as the Riva creek.