- TheRiversObandYeniseiflowintotheArcticOceanfromtheAltaiandSayanMountains.AriverrisingintheSayanMountainsofsouth-centralSiberianflowingabout965km(600mi)generallynorthtotheAngaraRiver.TheRussianplainisborderedonthesouthbytheCaucasianmountainrange.TheRi...
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