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This tag is used with tag man_made=tower

One use of an Observation tower is a tower that used to watch for and report forest fire. / Tour de surveillance des feux de forêt.

This feature is listed as being used in CanVec in the CanVec: Buildings and structures (BS) feature theme.

Caution: some OSM users use this tag to map man made towers at tourism=viewpoint. This practice was not documented.