Please answer the following question: Information: - Arkhangelsk Oblast ("Arkhangelskaya oblast") is a federal subject of Russia (an oblast). It includes the Arctic archipelagos of Franz Josef Land and Novaya Zemlya, as well as the Solovetsky Islands in the White Sea. - Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits. Yet the non-oceanic borders of Europea concept dating back to classical antiquityare arbitrary. The primarily physiographic term "continent" as applied to Europe also incorporates cultural and political elements whose discontinuities are not always reflected by the continent's current overland boundaries. - Russia (from the Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara. - Eurasia is the combined continental landmass of Europe and Asia. The term is a portmanteau of its constituent continents. Located primarily in the Northern and Eastern Hemispheres, it is bordered by the Atlantic Ocean to the west, the Pacific Ocean to the east, the Arctic Ocean to the north, and by Africa, the Mediterranean Sea, and the Indian Ocean to the south. The division between Europe and Asia as two different continents is a historical and cultural construct, with no clear physical separation between them; thus, in some parts of the world, Eurasia is recognized as the largest of five or six continents. In geology, Eurasia is often considered as a single rigid megablock. However, the rigidity of Eurasia is debated based on the paleomagnet data. - Novosibirsk is the third-most populous city in Russia after Moscow and St.Petersburg. It is the most populous city in Asian Russia, with a population of1,473,754 as of the 2010 Census. It is the administrative center of Novosibirsk Oblast as well as of the Siberian Federal District. The city is located in the southwestern part of Siberia on the banks of the Ob River adjacent to the Ob River Valley, near the large water reservoir formed by the dam of the Novosibirsk Hydro Power Plant, and occupies an area of . - In geography, a confluence is the meeting of two or more bodies of water. Also known as a "conflux", it refers either to the point where a tributary joins a larger river, (main stem), or where two streams meet to become the source of a river of a new name, such as the confluence of the Monongahela and Allegheny rivers in Pittsburgh, Pennsylvania creating the Ohio River. - The Ural or Jayq/Zhayyq (, ), known as Yaik before 1775, is a river flowing through Russia and Kazakhstan in Eurasia. It originates in the southern Ural Mountains and ends at the Caspian Sea. At , it is the third-longest river in Europe after the Volga and the Danube, and the 18th-longest river in Asia. The Ural River is conventionally considered part of the boundary between the continents of Europe and Asia. - Franz Josef Land, Franz Joseph Land or Francis Joseph's Land is an archipelago, inhabited only by Russian military base personnel, located in the Arctic Ocean, Barents Sea and Kara Sea, constituting the northernmost part of Arkhangelsk Oblast in Russia. It consists of 191 islands, which cover an area of , stretching from east to west and from north to south. The islands are categorized in three groups, a western, central and eastern, separated by the British Channel and the Austrian Strait. The central group is further divided into a northern and southern section by the Markham Strait. The largest island is George Land, which measures , followed by Wilczek Land, Graham Bell Island and Alexandra Land. - Vaygach Island is an island in the Arctic Sea between the Pechora Sea and the Kara Sea. - The White Sea ("Beloye more"; Karelian and , lit. Dvina Sea "Serako yam") is a southern inlet of the Barents Sea located on the northwest coast of Russia. It is surrounded by Karelia to the west, the Kola Peninsula to the north, and the Kanin Peninsula to the northeast. The whole of the White Sea is under Russian sovereignty and considered to be part of the internal waters of Russia. Administratively, it is divided between Arkhangelsk and Murmansk Oblasts and the Republic of Karelia. - Novaya Zemlya (lit. "new land"), also known, especially in Dutch, as Nova Zembla, is an archipelago in the Arctic Ocean in northern Russia and the extreme northeast of Europe, the easternmost point of Europe lying at Cape Flissingsky on the Northern island. Administratively, it is incorporated as Novaya Zemlya District, one of the twenty-one in Arkhangelsk Oblast, Russia. Municipally, it is incorporated as Novaya Zemlya Urban Okrug. - Nizhny Novgorod, colloquially shortened to Nizhny, is a city in the administrative center of Nizhny Novgorod Oblast and Volga Federal District in Russia. From 1932 to 1990, it was known as Gorky, after the writer Maxim Gorky, who was born there. The city is an important economic, transportation, scientific, educational and cultural center in Russia and the vast Volga-Vyatka economic region, and is the main center of river tourism in Russia. In the historical part of the city there are a large number of universities, theaters, museums and churches. Nizhny Novgorod is located about 400km east of Moscow, where the Oka empties into the Volga. Population: - Vychegda ( Russian : , Komi : , Ezva ) is a river in the European part of Russia , tributary to the Northern Dvina . Its length is about 1,100 kilometres ( 680 mi ) . Its source is approximately 310 kilometres ( 190 mi ) west of the northern Ural Mountains . It flows roughly in western direction , through Komi Republic and Arkhangelsk Oblast . The largest city along the Vychegda is Syktyvkar , the capital of Komi Republic . The Viled , the Yarenga , and the Vym are among its main tributaries . The Vychegda flows into the Northern Dvina in Kotlas ( Arkhangelsk Oblast ) . The river basin of the Vychegda comprises vast areas in Arkhangelsk Oblast and in the Komi Republic , as well as less extended areas in Kirov Oblast and Perm Krai . About 800 kilometres ( 500 mi ) of the Vychegda is navigable . In 1822 the Vychegda was connected to the river Kama , tributary of the river Volga , by Northern Ekaterininsky Canal , which however has been disused since 1838 . In summer there is regular passenger navigation connecting Kotlas and Soyga ( located approximately half - way between Solvychegodsk and Yarensk ) . - The Solovetsky Islands, or Solovki, are an archipelago located in the Onega Bay of the White Sea, Russia. - Saint Petersburg is Russia's second-largest city after Moscow, with fivemillion inhabitants in 2012, and an important Russian port on the Baltic Sea. It is politically incorporated as a federal subject (a federal city). Situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, it was founded by Tsar Peter the Great on May . In 1914, the name was changed from Saint Petersburg to Petrograd, in 1924 to Leningrad, and in 1991 back to Saint Petersburg. Between 17131728 and 17321918, Saint Petersburg was the imperial capital of Russia. In 1918, the central government bodies moved to Moscow. - Arkhangelsk, also known in English as Archangel and Archangelsk, is a city and the administrative center of Arkhangelsk Oblast, in the north of European Russia. It lies on both banks of the Northern Dvina River near its exit into the White Sea. The city spreads for over along the banks of the river and numerous islands of its delta. Arkhangelsk was the chief seaport of medieval and early modern Russia until 1703. A railway runs from Arkhangelsk to Moscow via Vologda and Yaroslavl, and air travel is served by the Talagi Airport and a smaller Vaskovo Airport. As of the 2010 Census, the city's population was348,783, down from356,051 recorded in the 2002 Census, and further down from415,921 recorded in the 1989 Census. - The Arctic Ocean is the smallest and shallowest of the world's five major oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, although some oceanographers call it the Arctic Mediterranean Sea or simply the Arctic Sea, classifying it a mediterranean sea or an estuary of the Atlantic Ocean. Alternatively, the Arctic Ocean can be seen as the northernmost part of the all-encompassing World Ocean. - Kotlas is a town in Arkhangelsk Oblast, Russia, located at the confluence of the Northern Dvina and Vychegda Rivers. Population: - The Ural Mountains, or simply the Urals, are a mountain range that runs approximately from north to south through western Russia, from the coast of the Arctic Ocean to the Ural River and northwestern Kazakhstan. The mountain range forms part of the conventional boundary between the continents of Europe and Asia. Vaygach Island and the islands of Novaya Zemlya form a further continuation of the chain to the north into the Arctic Ocean. What object entity has the relation of 'mouth of the watercourse' with the subject 'vychegda river'? Choices: - arctic ocean - atlantic ocean - barents sea - caspian sea - gulf of finland - indian ocean - kara sea - main - northern dvina river - ob - ohio river - onega bay - pacific ocean - sea - ural river - volga - vychegda - white sea
Answer:
northern dvina river