Holiup

high altitudeKopet Dagpolartemperateaurora borealisBonaire, Sint Eustatius and SabaBlackfootarchaeologyMalitropicalNorth-AmericaBermudaSvalbard and Jan MayenOceaniacitiesNorfolk Island

caves at Uetikon, Switzerland

Baptist Cave

23km

Täuferhöhle7

Täuferhöhle6

Täuferhöhle5

Hell grottos

25km

Höllgrotten Baar lower cave 20201015

Höllgrotten 09

Höllgrotten 05

Round Lime Formations Hell-Grottoes

Water boundary

Undewater formations Baar