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MaliUgandaDominicahigh altitudeKiribatiW. Br. Iowakids' activitiesNorth-AmericaHindu KushwaterfallsoutdoorarchaeologyUnited KingdomAfricaskiing & snowboardingmountains

      caves at Feldmeilen, Switzerland

    • Hell grottos
      23km
      wikipedia
      Höllgrotten Baar lower cave 20201015
      Höllgrotten 09
      Höllgrotten 05
      Round Lime Formations Hell-Grottoes
      Water boundary
      Undewater formations Baar