Why did the Manchus build a shipyard at Jilin city in 1651?

In 1651, the Manchus established a shipyard at Jilin city primarily out of concern regarding Russian incursions into the Amur River region.1

The shipyard was built to construct boats intended for both defense and transport along the Sungari River, which served as a vital tributary to the Amur. This strategic move was part of the broader efforts by the Qing dynasty to secure their northern territories and counter the eastward expansion of Russian power in the area.12