The Russian plain is bordered on the south by the Caucasian mountain range. The Rivers Ob and Yenisei flow into the Arctic Ocean from the Altai and Sayan Mountains.

• 俄罗斯平原南边与高加索山脉毗接。鄂毕河和叶尼塞河的源头分别起源于阿尔泰山和萨彦岭，流入北冰洋。