Gulf of Anadyr, gulf in far eastern Russia, in the northwestern part of the Bering Sea. The width of the gulf at its entrance is about 250 miles (400 km), and it runs inland for some 200 miles (320 km), extending into the Bay of Krest and the Anadyr River estuary. The Gulf of Anadyr is closed by floating ice for 10 months of the year. On the estuary of the Anadyr lies the port of Anadyr, serving the Chukchi Peninsula.