[Tagging] Area country borders

[Paul Allen]

I just encountered this video https://www.youtube.com/watch?v=Mw44wHG4KOc
explaining that the border between Germany and Luxembourg, along the
Moselle river, is not a line in the centre of the river but is the entire
width of the river.  If you're in a boat on the river, or on the bridge
crossing it, you're legally in two countries simultaneously.

Do we have a way of mapping this?  Should we have a way of mapping this? Or
should we just pretend the border is a line?

-- 
Paul
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