Bristol Bay (Iilgayaq in Central Yup'ik) is the eastern-most arm of the Bering Sea, at 57° to 59° North 157° to 162° West. It is located between the southwest part of the Alaska mainland to its north, and the Alaska Peninsula to its south and east. Bristol Bay is 400 km (250 miles) long and 290 km, (180 miles) wide at its mouth. A number of rivers flow into the bay, including the Cinder, Egegik, Igushik, Kvichak, Meshik, Nushagak, Naknek, Togiak, and Ugashik.