How does the San River affect the course of the Vistula River?

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Vistula River The Elbe, Oder, and Vistula river basins and their drainage network.

The San River is a significant tributary that serves as a key geographic marker for the Vistula River's course. Its confluence with the Vistula near Sandomierz acts as a boundary that delineates the river's three principal sections.1

Specifically, the inflow of the San River marks the end of the Vistula's upper reach and the beginning of its middle reach. Following this confluence, the Vistula changes its direction, turning northward to breach a gap through an upland area.1