Oka River (English spelling)

Japanese: オカ[川]（英語表記）Oka

(1) A tributary of the right bank of the Volga River that flows through almost the center of European Russia in the Russian Federation. It is 1,500 km long and has a drainage area of 245,000 km2. It originates in the Central Russian Plateau, flows northeast from Kaluga, and then flows east through an area about 80 km south of Moscow, east of Ryazan, and joins the Volga at Nizhny Novgorod. It has many tributaries, including the Moscow River that flows through the city of Moscow. Except during the winter freezing season (late October to April), it is navigable up to the upper reaches of Kaluga, and its main ports are Kaluga, Dzerzhinsk, Ryazan, and Nizhny Novgorod.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

(1)ロシア連邦，ヨーロッパ･ロシアのほぼ中央を流れる，ボルガ川右岸の支流。長さ1500km，流域面積24万5000km2，中央ロシア台地に源を発し，カルーガから北東にむかい，モスクワの南約80kmの地域を東に流れ，リャザンの東方を経てニジニ･ノブゴロドでボルガに合流する。多くの支流があり，モスクワ市内を流れるモスクワ川もその一つ。冬季の結氷期(10月末～4月)をのぞき，カルーガの上流まで航行可能で，主要な港はカルーガ，ジェルジンスク，リャザン，ニジニ･ノブゴロドなどである。

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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