This is the 8914th most frequent German word.
langenau
"Langenau" is a proper noun, typically referring to a town in Germany.
Here, 'Langenau' is used as a proper noun referring to a specific location, possibly a town or city name.
Ich fuhr nach Langenau, um Freunde zu besuchen.
I drove to Langenau to visit friends.
In this sentence, 'langen Au-' is a descriptive phrase where 'langen' (long) modifies 'Au-strecken' (meadow stretches), which is a compound noun referring to long areas of a river valley or meadow.
Die langen Au-strecken waren schwer zu durchqueren.
The long meadow stretches were difficult to traverse.
Here, 'langen Au' is treated as a term or concept within a cultural or mythological context, describing a long meadow or area.