Arkhangelsk Oblast the main shipyard for the Russian Navy. Among the oldest populated places of the oblast are Kholmogory, Kargopol, and Solvychegodsk; there are a number of Russian Orthodox monasteries, including the Antoniev Siysky Monastery and the World Heritage Site of the Solovetsky Islands in the White Sea. Plesetsk Cosmodrome is one of three spaceports in Russia (the other two are Kapustin Yar in Astrakhan Oblast and Yasny in Orenburg Oblast). Arkhangelsk Oblast, which includes Nenets Autonomous Okrug, borders Kirov Oblast, Vologda Oblast, the Republic of Karelia, the Komi Republic, and the White, Pechora, Barents and Kara seas. Cape Fligely in Franz
Volgograd Oblast the east. The two main rivers in European Russia, the Don and the Volga, run through the oblast and are connected by the Volga–Don Canal. Volgograd Oblast's strategic waterways have made it a popular route for shipping and for the generation of hydroelectricity. Volgograd Oblast is best known as the primary site of the Battle of Stalingrad during World War II, often regarded as one of the single largest and bloodiest battles in the history of warfare. Volgograd Oblast borders with Saratov, Rostov, Astrakhan, and Voronezh Oblasts, as well as with Kalmykia of Russia and with Kazakhstan (West Kazakhstan Region).