The study of the mire vegetation on the coast of the Onega Pomorie National Park showed that the reed communities of Unskaya Bay are the most widespread and extensive and they are represented by three ecological types: coastal-aquatic, halophytic-meadow and mire-herbaceous communities. Marshes in the Letne-Zolotitsky stretch are rare and small, with communities dominated by sedges, cotton-grass, and saltmarsh flat-sedge. A unique component of the nature of the Onega Pomorie National Park and the entire White Sea coast is forest-mire combinations on ancient longshore bars and troughs located
to the west and east of Unskaya Bay’s mouth.