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
Battle of Bolshie Ozerki of the intervention to involve American forces, though they successfully defended their camp from a Russian attack at Romanovka composed of forces that greatly outnumbered them two months later and inflicted hundreds of casualties during the Suchan Valley Campaign the following month. Allied forces began to withdraw rapidly from northern Russia shortly thereafter. Bolshie Ozerki was a small village situated between the port city of Onega and an important Allied position at Obozerskaya Station, along the Arkhangelsk-Vologda railroad. Because the port of the main Allied base at Arkhangelsk froze every winter, reinforcements had to be brought overland to the front