In German it is the Donau. So I assume that this is the case in Austria.
the Rhine and the donau are rhivers in Germany
Via donau's population is 270.
Via donau was created in 2005.
RC Donau was created in 1989.
The population of Mautern an der Donau is 3,074.
Krems an der Donau was created in 1305.
The population of Neustadtl an der Donau is 2,100.
Tulln an der Donau's population is 13,591.
Hainburg an der Donau's population is 5,651.
The population of Emmersdorf an der Donau is 1,706.
Orth an der Donau's population is 1,966.