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
Primorsky District, Arkhangelsk Oblast in Plesetsky District. There are many roads around Arkhangelsk. The Northern Dvina is navigable, and there is regular passenger navigation upstream from Arkhangelsk. There is also regular, albeit infrequent, sea passenger navigation connecting Arkhangelsk with the settlements on the Onega Peninsula (including Pertominsk, Lopshenga, and Letnyaya Zolotitsa) which are not connected to the all-season road network. Arkhangelsk also has air connections with these settlements, as well as with Solovetsky Islands. There are two state museums in the district. The Malye Korely Open Air Museum is located approximately south of Arkhangelsk. It was created to protect the oeuvres of the Russian