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The 11,900 square kilometres (4,600 sq mi) basin of the Shinano-Chikuma River system is the third largest in Japan and at 367 kilometres (228 mi), is the longest river in the country. The river system supports a population of around 3 million (as of 2009) and supports significant agriculture and electricity generation. [1] [26]: 182 The river ...
Rivers of Japan are characterized by their relatively short lengths and considerably steep gradients due to the narrow and mountainous topography of the country. An often-cited quote is 'this is not a river, but a waterfall' by the Dutch engineer ( o-yatoi gaikokujin ) Johannis de Rijke who had visited the Jōganji River , Toyama Prefecture .
[6] [7] If a river system is designated Class A, all the constituent rivers are also designated as such. Therefore, Class B rivers cannot coexist with Class A rivers in the same river system. [7] This designation is also called First Class. Class A river (一級河川, Ikkyū kasen) is a designation which applies to important individual rivers ...
It can be thought of as a list of the biggest rivers on Earth, measured by a specific metric. For context, the volume of an Olympic-size swimming pool is 2,500 m 3 (88,000 cu ft). The average flow rate at the mouth of the Amazon is sufficient to fill more than 83 such pools each second.
A. Abashiri River; Abe River; Abukuma River; Agano River; Agatsuma River; Agi River; Ai River (Gifu) Aibiki River; Aikawa River (Miyagi, Japan) Aka River; Akan River
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Even when detailed maps are available, the length measurement is not always clear. A river may have multiple channels, or anabranches. The length may depend on whether the center or the edge of the river is measured. It may not be clear how to measure the length through a lake or reservoir. Seasonal and annual changes may alter both rivers and ...
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