Dvina Bay
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 . 
<triplet> Mezen Bay <subj> White Sea <obj> part of <triplet> Onega Bay <subj> White Sea <obj> part of <triplet> Kandalaksha Gulf <subj> White Sea <obj> part of