Bavaria is one federal state or Bundesland of the Federal Republic of Germany, which means it is a political unit. The following regions are rich in caves and/or mines. However, the borders of these geographical or geological regions are not political, and may extend into neighbouring federal states.
The above units do not cover the whole state, this are just the geological units which are prone to caves or mining. Subterranea on the other hand may occur everywhere independently of the geological situation, so if they are not in one of the above regions, we list them here: