BRITISH ISLES Boundaries Analysis
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Based on Overpass query "http://overpass-api.de/api/interpreter?data=[timeout:3600];(rel["boundary"](50.06419,-11.1621,59.04055,2.19727););( ._;way(r););out meta;" ran at 18 Mar 2019 10:11:00 Z
POLITICAL Boundaries
Only Show Invalid relations
Tag:boundary=political (OSM wiki)
OS_OpenData_BoundaryLine