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| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| Oka, river, Siberian Russia |
| river, c.600 mi (970 km) long, rising in the Sayan Mts., Buryat Republic, S central Siberian Russia. It flows N through Irkutsk oblast to join the Angara River below Bratsk. The lower Oka valley is flooded by waters impounded behind Bratsk Dam. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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