Crossword puzzle clue "it flows underground"

Here are the possible solutions for it flows underground clue

Answer
Clue
Relevancy
sewage
Clue
It flows underground
aar
Clue
Swiss river that flows into the Rhine (Var.)
Swiss river that flows into the Rhine
aare
Clue
River that flows from the Bernese Alps
River that flows from a glacier in the Alps
It flows to the Rhine
It flows through the Lake of Thun
It flows past Olten

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