Dvina Bay streams. There are many small islands in the Dvina Bay as well, the biggest being Mudyug Island. A national park, Onezhskoye Pomorye National Park, was open on the Onega Peninsula on 26 February 2013. The Dvina Bay is limited by the Onega Peninsula from the west. At the eastern side, the shore steeply rises to a plateau (White Sea - Kuloy Plateau) which drains east into the Soyana, a major tributary of the Kuloy. The Onega Bay shore is often referred to as "Letny Bereg" (Summer Coast), and the eastern shore of the bay is "Zimny Bereg" (Winter Coast). The
Arkhangelsk serves as the administrative center of Primorsky District, even though it is not a part of it. As an administrative division, it is, together with five rural localities, incorporated separately as the city of oblast significance of Arkhangelsk—an administrative unit with the status equal to that of the districts. As a municipal division, the city of oblast significance of Arkhangelsk is incorporated as Arkhangelsk Urban Okrug. The mayor (as of July 2017) is Igor Viktorovich Godzish, who was elected in 2015. For administrative purposes, the city is divided into nine territorial okrugs: Nordavia (formerly Aeroflot Nord) airline has its head