The Dvina Bay is located in Arkhangelsk Oblast in Northwestern Russia. It is one of four large bays and gulfs of the White Sea, the others being the Mezen Bay, the Onega Bay, and the Kandalaksha Gulf. The two main river emptying into the Dvina Bay is the Northern Dvina River, while the two cities on the bay are Arkhangelsk and Severodvinsk. The Dvina Bay is 93 kilometres long and 130 kilometres wide. Administratively, the coast and the islands belong to Primorsky District of Arkhangelsk Oblast.
The Northern Dvina forms a delta entering the Dvina Bay, with many islands separating different streams. There are many small islands in the Dvina Bay as well, the biggest being Mudyug Island.
Wikipedia https://en.wikipedia.org/wiki/Dvina_Bay
Coordinates 64°58'10.861" N 39°21'59.327" E