Parts of this ancient river 's bed can still be seen in ( now waterless ) canyons in today 's landscape of the Swabian Alb .
This ancient river 's bed was much larger than today 's Danube .
Parts of this ancient river 's bed , which was much larger than today 's Danube , can still be seen in ( now waterless ) canyons in today 's landscape of the Swabian Alb .