James,
I was trying to think if there was a way to do this with the
interactive Wikimedia maps. You'd need some way to extract the
bounding boxes. If they are stored in OSM or Wikidata it looks like
that might be possible programmatically with the current software. [0]
Otherwise it looks like a more manual process. :/
I'm afraid I'm not super savvy in this area, but maybe some of this
might be helpful?
[0]
https://www.mediawiki.org/wiki/Help:Extension:Kartographer#GeoShapes_via_Wi…
Yours,
Chris Koerner
Community Liaison
Wikimedia Foundation