Amusing Planet: It is Lake Constance that connects the waters of both rivers. Although the Danube never enters the lake, a part of its water does. This is because in its upper course, just 23 or 24 kilometers after its source, the Danube disappears.
The place where this happens is appropriately called Donauversickerung (which in German means Danube sinkhole) and is near the town of Immendingen at an altitude of about 673 meters. There, the river water filters through the caverns of the karst system below, flowing through them in a southerly direction.
The first time the complete disappearance of the Danube was documented was in 1874. Since then, “disappearances” have been recorded ranging from just 29 days a year to 309 (the latter in 1921). The annual average of days when the river completely disappears is around 155 days, mainly in the summer months. MORE HERE
So that’s where the worlds common sense has gone.
I get that versickerung feeling just thinking about 2024.
Ukraine has been the largest sinkhole for the United States.
What flows to Ukraine, never reappears (except the 10% for the Big Guy).
As Spike Jones sang so many years ago, the Danube isn’t blue; it’s green.