The major river that runs through the city of Budapest is the Danube. This river is significant as it flows through multiple countries in Europe and serves as a vital waterway for commerce and transportation. In Budapest, the Danube separates the historic districts of Buda and Pest, contributing to the city's stunning architectural landscape, including the iconic Parliament Building. The river has been central to Budapest's cultural and historical identity for centuries, making it a focal point for both locals and tourists alike.