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 Oblast and the selo of Leshukonskoye, and there are still no roads into the Nenets Autonomous Okrug, on the left bank of the Onega downstream from Severoonezhsk, and very few roads on the right bank of the Northern Dvina. Many rivers can only be crossed by ferry boats, which means they cannot be crossed during the ice melting period. There is regular bus service on the main roads. The principal railway line in the oblast is the railroad connecting Moscow and Arkhangelsk. The piece between Vologda and Arkhangelsk was constructed in 1890s and passed through previously uninhabited areas between the valleys