Arkhangelsk Oblast the south-west of the Oblast drains into the Kema River which belongs to the basin of the Caspian Sea. The area in the Onega River basin containing the biggest lakes in the oblast, such as Lake Lacha, Lake Kenozero, Lake Undozero, and Lake Kozhozero. The tundra of the Nenets Autonomous Okrug also contains a number of bigger lakes. The river basin of the Pinega is characteristic of the karst, with a number of caves in the region. The White Sea coast within the Oblast is split into the Onega Bay (where the Onega is the major tributary), the Dvina Bay
Arkhangelsk It was also the scene of Mudyug concentration camp. During both world wars, Arkhangelsk was a major port of entry for Allied aid. During World War II, the city became known in the West as one of the two main destinations (along with Murmansk) of the Arctic Convoys bringing supplies in to assist the Soviet Union. During Operation Barbarossa, the German invasion of the Soviet Union in 1941, Arkhangelsk was one of two cities (the other being Astrakhan) selected to mark the envisaged eastern limit of Nazi control. This military operation was to be halted at this A-A line but