...Its drainage area is 1.36 million km2, one-third the size of European Russia and 3.7 times the size of Japan. Its existence was known to the Greeks before classical antiquity, and Ptolemy called it the Rha River. Since the Middle Ages, it has flourished as a trade route connecting Northern Europe and Central Asia, and along its coasts the Volga Bulgars, the Khazar nations, the Kipchak Khanate, the Kazan Khanate, the Astrakhan Khanate, and others have risen and fallen. *Some of the terminology that mentions "Rha" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…流域面積は136万km2で,ヨーロッパ・ロシアの1/3,日本の3.7倍にあたる。その存在は,古典古代以前のギリシア人にも知られており,プトレマイオスはラーRha川とよんでいた。中世以来,北ヨーロッパと中央アジアを結ぶ交易路となって栄え,その沿岸では,ボルガ・ブルガール族,ハザル族の国家,キプチャク・ハーン国,カザン・ハーン国,アストラハン・ハーン国などが興亡をくりひろげた。… ※「Rha」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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