The villages on the south banks of the Danube are elevated and thus enjoy a certain degree of natural flood protection. Consisting mainly of gravel, the slopes may be set in motion by heavy rainfall, the effects of which may be clearly seen along the walking trails. Here and there in the slope forest the Common Beach may be found; this is somewhat unusual given the relatively low altitude.
Along the Danube, numerous traditional fishing huts with their typical square fishing nets attached to flexible poles can be seen. But only licensed hobby fishermen will be pulling nase and Barbel from these waters, as commercial Austrian fisheries disappeared from the Danube in the 1950s.
This stretch of the river is free from ice in the winter, and is thus a popular over-wintering site for ducks from Northern Europe. From November to February, the pochard, Common Goldeneye duck and cormorant may be observed diving for food and sitting with spread wings in order to dry their feathers.
Before the Donau-Auen National Park was even founded, Haslau was the site the region's first water connectivity project. The lowering of the towpath ("Treppelweg") and the concrete box culvert would today seem like minor attempts to supply the wetlands with more water, yet in flood conditions, these sections are transformed by roaring currents. Under such circumstances, crossing is perilous. The so-called Mitterhaufen, a core zone within the National Park, has been significantly transformed by these measures, thus fulfilling the original aims of the project.
Shallow gravel banks run along the Danube directly adjacent to the Haslau Traverse, and during periods with low water levels, it is possible to wade out almost to the middle of the river. This section of the river may be used as a natural swimming area. Animal tracks may be observed in the fine river sand. The waves of fast-moving boats and ships propel many river organisms far over the beaches to the areas around the willows; many small creatures find it impossible to return back to the aquatic environment they need in order to survive.