The largest inner delta area with an almost natural status left in the entire Upper Danube Valley rests in the Szigetköz Region, Hungary. The Danube’s natural landscape in this area was characterized by continuously changing dead branches and side arms, beds changing their location, deteriorating and building islands and alluvial cones. As a result, the ecological environment and human settlements of the area were consistently destabilized. In 2011, the North-Transdanubian Water Directorate (EDUVIZIG) started a water infrastructure project entitled the “Ecological development of water supply system in the protected site and floodplain areas of Szigetköz”. This project shares valuable experience on how to restore the natural ecosystem while securing provision of drinking water and irrigation and enhancing flood protection mechanisms.