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Which mountain ranges surround the upper Amur River valley?

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Topographic map of the Amur River basin and its drainage network, covering parts of northeastern China, eastern Russia, Mongolia, and North Korea. The map uses color shading to indicate elevation, shows major rivers and tributaries, surrounding mountain ranges, swamps, marshes, and lakes, and includes a locator inset of the region within Asia. Major cities, railways, and dams are also marked. — Amur River The Amur River basin and its drainage network.

The upper Amur River valley is situated between two primary mountain ranges: the Da Hinggan (Greater Khingan) Range to the south, which is characterized by thick larch forests, and the Amarzar Range to the north, which features pine-clad slopes.1