Donau Brittanica
Britannica online encyclopedia article on danube river:
river of europe, the second longest river after the volga. it rises in the black forest mountains of western germany and flows for some 1,770 miles (2,850 km) to its mouth on the black sea. along its course, it passes through nine countries: germany, austria, slovakia, hungary, croatia, serbia, bulgaria, romania, and ukraine.
http://www.britannica.com/eb/article-9106065/danube-river
Donau Rivernet
Donau Rivernet
http://www.rivernet.org/danube/danube.htm
Donau rivier Algemeen
Die donau ~ faszination eines flusses
http://www.danube-river.org/site/index.php
Donau Unesco
Donau Unesco
http://whc.unesco.org/sites/588.htm
Donau.com
Donau-niederösterreich tourismus: infos zu urlaub an der donau, am donauradweg, jakobsweg und rund um schifffahrt in der wachau.
http://www.donau.com/donau/portal/