Final answer:
The Sava River flows through Zagreb, Croatia. It is an important river in the region and a major tributary of the Danube River, which together with the Rhine divides Europe.
Step-by-step explanation:
The river that flows through Zagreb, in Croatia, is the Sava River. The Sava is an important river in Central and Southeastern Europe, flowing through Slovenia, Croatia, Bosnia and Herzegovina, and Serbia.
It is a major tributary of the Danube River, which is one of the main rivers dividing Europe along with the Rhine. Zagreb, the capital and largest city of Croatia, is situated on the banks of the Sava River, which provides significant resources for transport, trade, and recreational activities.
Rivers have played a crucial role in European history by providing adequate transportation for travel and trade. Cities along these rivers, like Zagreb on the Sava River, have often become central to the regions in which they are located due to the strategic and economic advantages offered by these waterways.