White Sea small. The main island group is the Solovetsky Islands, located almost in the middle of the sea, near the entrance to Onega Bay. Kiy Island in Onega Bay is significant due to a historic monastery. Velikiy Island, located close to the shore, is the largest island in the Kandalaksha Gulf. The White Sea is a water-filled depression in the block of a continental shelf known as the Baltic Shield. Its bottom is very uneven and contains the Kandalaksha Hollow in the northwest and the Solovetsky Islands in the south. Also, the Onega Bay has many small underwater elevations. The opening
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