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Public-images-osm logo.svg natural = fumarole
Námafjall in summer 2009 (2).jpg
A fumarole is an opening in a planet's crust, which emits steam and gases Show/edit corresponding data item.
Group: Natural
Used on these elements
may be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
See also
Status: approvedPage for proposal

A  Fumarole is an opening in a planet's crust, which emits steam and gases. They are found in volcanic areas and geothermal fields.

Comparison with existing features

Fumaroles are similar to geysers and hot_springs. There are a few key differences:

  • Hot Springs produce hot water.
  • Fumaroles emit small quantities of steam/gas (no liquid water, but they may cause nearby water to boil).
  • Geysers dramatically eject a large volume of water and steam in a burst upwards.

Helpful diagram

Examples of fumaroles

Examples of ambiguous situations

Examples of other geothermal features


Ideally, individual fumaroles would be mapped as a node Node. If the vent is large enough, you could use an area Area.

If you can not identify the locations of the individual fumaroles, you could draw an area Area to cover the whole area that appears to be steaming. This is not the recommended approach but is still acceptable.

Extinct fumaroles

Inactive fumarole in the Valley of Ten Thousand Smokes

Fumaroles may become extinct, either as a natural process or if geothermal bores or power plants are constructed nearby. Extinct fumaroles should normally be deleted from OSM. In rare cases, if they are very significant they could be mapped as was:natural=fumarole.

See Also

Possible Tagging Mistakes

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