|Feature : Boundaries|
|Boundaries mark the borders of areas, mostly political, but also of other administrative areas.|
Also see the boundary relation.
The following values are possible, though might be old due to the new admin_level tag
marks country borders, such as the border between Austria and Germany. The names of the countries is specified through the tags "left:country", "right:country", if used on a linear way rather than an enclosed/area way.
There is some controversy about what is the exact meaning of country. For the sake of clarity, only political entities listed on the ISO 3166 standard are to be considered countries.
boundary=administrative + admin_level=3 to 11
marks subnational borders. The names of the subnational entities involved is specified as with national borders, with "parish", "district", "region", "province", "state"
- for marking maritime borders (rather than land areas normally assumed by boundary=administrative and following the coastlines)
- is approved, should be documented in each country where they are used. Can be used for electoral boundaries, or administrative areas not covered by the strict hierarchical model in specific countries (because they don't create exclusive partitions).
- a more recently introduced tag with a more verbose tagging scheme which can deal with all kind of protections and protection levels. It encompasses both nature reserves and national parks.
- trial for dioceses, parishes... First used, discussed and supported in France, but also used now in other countries (see FrViPofm/Tag:boundary=religious_administration)
- trial: When metropolitan areas don't match with an administrative subdivision (sometimes even country borders are crossed), this tag could be used.
- place=* for toponyms, human settlements and fractions of them.