ウィーンの森
The Wien is subject to huge variations in flow. In its headwaters in the Vienna Woods, the soil is underlain by sandstone. Because of this, during heavy rain the soil quickly saturates, resulting in substantial runoff. Thus, the flow of the Wien can quickly increase from a creek-like to in the heaviest rains or during the spring snowmelt in the Vienna Woods, a ratio of over 1:2000.