How does the Amur River change after it enters the Zeya-Bureya Depression?

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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.

Upon entering the Zeya-Bureya Depression, the middle Amur exhibits distinct topographical features: the left bank rises gradually toward the plain of the depression, while the right bank remains steep and high, bordering the Xiao Hinggan (Lesser Khingan) Range of China.1

As the river continues its course, the plain gradually narrows below the confluence of the Bureya River. Near Pashkovo, the river passes spurs extending from the Bureya Range. Subsequently, it flows through a narrow gorge within the Xiao Hinggan Range, where both its depth and speed increase dramatically.1