Viga (river)
The Viga (russian: Вига) is a river in Kostroma Oblast in Russia, a right tributary of the Unzha The Unzha (russian: Унжа) is a river in the Vologda Oblast and Kostroma Oblast in Russia, a tributary of the Volga. It is long, and its basin covers .

Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the world, with its internationally recognised territory covering , and encompassing one-eighth of Earth's inhabitable landmass. Russia extends across Time in Russia, eleven time zones and shares Borders of Russia, land boundaries with fourteen countries, more than List of countries and territories by land borders, any other country but China. It is the List of countries and dependencies by population, world's ninth-most populous country and List of European countries by population, Europe's most populous country, with a population of 146 million people. The country's capital and List of cities and towns in Russia by population, largest city is Moscow, the List of European cities by population within city limits, largest city entirely within E ...
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Unzha
The Unzha (russian: Унжа) is a river in the Vologda Oblast and Kostroma Oblast in Russia, a tributary of the Volga. It is long, and its basin covers .«Река Унжа»
Russian State Water Registry The Unzha begins at the of the rivers and the Lundonga. It flows into the Unzhensky of the

Kostroma Oblast
Kostroma Oblast (russian: Костромска́я о́бласть, ''Kostromskaya oblast'') is a federal subject of Russia (an oblast). Its administrative center is the city of Kostroma and its population as of the 2021 Census is 580,976. It was formed in 1944 on the territory detached from neighboring Yaroslavl Oblast. Textile industries have been developed there since the early 18th century. Its major historic towns include Kostroma, Sharya, Nerekhta, Galich, Soligalich, and Makaryev. History From c. 300 CE the current area of Kostroma, with the exception of the area east of the Unzha River, was part of the Finno-Ugric peoples' lands, such as the Merya people and their loose tribal confederation. During the Neolithic era, comb-ceramics replaced prafinno-Ugric Volosovo. At the turn of 3rd and 2nd millennia BCE, the Fatyanovo culture arrived in the area, later to be assimilated into the tribes of the Late Bronze Age (the Abashevo culture and the Pozdnyakovskaya ...
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Tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean. The Irtysh is a chief tributary of the Ob river and is also the longest tributary river in the world with a length of . The Madeira River is the largest tributary river by volume in the world with an average discharge of . A confluence, where two or more bodies of water meet, usually refers to the joining of tributaries. The opposite to a tributary is a distributary, a river or stream that branches off from and flows away from the main stream."opposite to a tributary"
PhysicalGeography.net, Michael Pidwirny & S ...
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Drainage Basin
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the '' drainage divide'', made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern. Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, and impluvium. In North America, they are commonly called a watershed, though in other English-speaking places, "watershed" is used only in its original sense, that of a drainage divide. In a closed drainage basin, or endorheic basin, the water converges to a single point inside the basin, known as a sink, which may be a permanent lake, a dry lake, or a point where surface water is lost underground. Drainage basins are similar ...
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