Slightly off-topic - while I know that there are these lists of “crazy long German words” to make fun of each one of your examples besides the “Donau..” I actually used normally in conversations in the past.

Even just a couple days ago I came across “Personalisierungsinfrastrukturkomponente“ [0] in a news article, so it is not just a rumor that Germans like long-ass words :)

[0] Apparently these are the devices used by the government to verify passports and / or fingerprints of refugees.