New answers tagged county
We provided an easy to use JSON format for country adjacency based on COW dataset, have a look and fork it on github :) https://github.com/P1sec/country_adjacency
What you are asking for are shapes of (unbroken!) boundary relations from places. Some preprocessed shapes can already be downloaded here: http://download.geofabrik.de/europe.html Another way is to get it via the wikipedia articles: http://wiki.openstreetmap.org/wiki/WIWOSM But the manual processing isn't that easy: Determine OSM boundary relation ID ...
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