马拉尼翁河（西班牙语：Río Marañón）发源自秘鲁利马东北160公里，向西北方向流经安第斯山脉河谷到达南纬5度36分，然后转往东北方向横越安第斯山脉，与乌卡亚利河（Ucayali River）汇流，成为亚马孙河。
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