The Mezen Bay (Russian: Мезенская губа) is located in Arkhangelsk Oblast and Nenets Autonomous Okrug in Northwestern Russia. It is one of four large bays and gulfs of the White Sea, the others being the Dvina Bay, the Onega Bay, and the Kandalaksha Gulf. The Mezen Bay is the easternmost of these, as it lies to the south of the Kanin Peninsula. Morzhovets Island lies at the entrance of the bay. The two main rivers emptying into the Mezen Bay are the Kuloy River, and the Mezen River. The area of the bay is 6,630 square kilometres (2,560 sq mi). The Mezen Bay is 105 kilometres (65 mi) long and 97 kilometres (60 mi) wide. The tides in the Mezen Bay are up to 10 metres (33 ft) high and are the biggest in the White Sea. The northern part of the bay, just south of Morzhovets Island, is crossed by the Arctic Circle.