|place = region|
|Used both as a broad tag for geographic or historical areas with no clear boundary and for distinct administration areas (with specific boundaries) in some countries.|
|Used on these elements|
|Status: in use|
|Tools for this tag|
This is a tag from the earliest days of OpenStreetMap, is used in various ways, was never clearly defined and is rarely used by data consumers.
It is used for The Triangle and The Triad, both of which encompass multiple cities and have ambiguous boundaries, because no other place=* seemed appropriate. Rendering based on population=* would probably seem reasonable to the author who is not sure how many non-locals would recognize the names.
In Czech Republic it is used to mark admin_level=6.= NUTS 3 (Region) which is
Discouraged for administrative regions
In most situations, do not apply any tags to the ways (role of "outer") which forms part of that relation. The use of this tag is redundant, however convention may change in the future. For the time being and until a formal convention is established, the use of this tag should be limited to historical edits only.