Kleine Tulln

The Kleine Tulln is a river in Lower Austria that begins as the Koglbach near Rekawinkel. It flows north for about twenty-four kilometres through villages such as Kogl and Sieghartskirchen before reaching Tulln. Since the 1980s, high water is diverted near Judenau into the Große Tulln, while low flows continue through old channels to the Danube. The river’s catchment covers ninety-seven square kilometres and is fed by streams like the Haberbach and Starzbach. From its source it passes through the Flysch zone’s waterproof sandstones and marls, then narrow Molasse ridges before widening onto the flat Tullnerfeld gravels. These geologies shape how water moves and where it can be seen. Walkers can follow the Kleine Tulln’s banks through quiet villages and open fields. The riverbanks show layered rocks from the Cretaceous and Neogene periods, while the flat Tullnerfeld offers wide views across the Danube valley. Near Greifenstein the old riverbed forms backwaters where water still lingers after rain.