"Kalbach-Riedberg" is centered around only "Riedberg". "Kalbach" has its own entry centered around "Kalbach".

"Kalbach-Riedberg" should cover either both areas, or Riedberg should be labelled "Riedberg" just like Kalbach is labelled "Kalbach".

see https://de.wikipedia.org/wiki/Frankfurt-Kalbach-Riedberg for details