Ochakov (əchäˈkəf) [key], city, Ukraine, on the Dnieper-Buh estuary and on the Black Sea. It is the center of an agricultural district and a seaport with fishing industries. In the 7th and 6th cent. B.C., there were several Greek colonies in the area, and Ochakov is on the site of the ancient Greek city of Alektor. In 1492 a Crimean khan built a fortress called Kara-Kermen there. When the Turks took control of it, they renamed it Ochakov. In the 16th and 17th cent., the Ukrainian Cossacks attacked the Turks at Ochakov. The city fell to the Russians (1788) during the Russo-Turkish War from 1787 to 1792. In the Crimean War it was occupied (1855) by the allies. Ochakov is near the site of the ancient Greek colony of Olbia.