奥涅加湾位于俄罗斯西北部阿尔汉格尔斯克州西南部，长度185公里，阔50至100公里，平均深度16米，最大深度36米，是白海四大港湾之一，其余为德维纳湾、梅津湾和坎达拉克沙湾。流入奥涅加湾的河流有阿尼加河、科恩河和维格河，而西岸城镇有白海城和白海-波罗的海运河。

The Onega Bay (Russian:Онежская губа, Онежский залив) is located in the Republic of Karelia and Arkhangelsk Oblast in Northwestern Russia, west of the city of Arkhangelsk. It is the southernmost of four large bays and gulfs of the White Sea, the others being the Dvina Bay, the Mezen Bay, and the Kandalaksha Gulf. The area of the bay is 6,630 square kilometres (2,560 sq mi). The Onega Bay is 185 kilometres (115 mi) long and 50 kilometres (31 mi)-100 kilometres (62 mi) wide. The average depth of the bay is 16 metres (52 ft), and the maximum depth is 36 metres (118 ft). The bay freezes in winter.