How were the islands near Bratislava formed by the Danube River?

The islands near Bratislava were formed as a result of the Danube River emerging from the Hungarian Gates Gorge. Upon exiting the gorge, the river's stream slows down abruptly, causing it to lose its transporting capacity. Consequently, enormous quantities of gravel and sand settle on the riverbed. This depositional process led to the formation of two major islands—one on the Slovak side and one on the Hungarian side—which together cover approximately 730 square miles (1,900 square km).1