The county borders in the UK mostly seem to go unmarked, except on A roads when it's usually apparent that the border is in a different place according to which way you are driving!
There are 68 points where three counties meet*, and it seems to me that we should be marking these tripoints. I'm fortunate enough to be split across the country and will be marking another in due course, but it would be nice if folks might want to mark their own tri-county border. I'm not aware of any group already targeting this, I can only find a few existing at the moment:
Search geocaching.com
Generally borders follow rivers so, for this cache, the actual point is in the middle of the Nene, but this cache is placed on the border between Norfolk and Cambridgeshire and Lincolnshire is directly ahead, in the river.
For those of us who live near a corner there is always fun with postcodes not matching our counties, phone numbers for unrelated places and, for the pedants amongst us, automatic address finders always insisting that we live in a different county...
*I think there's one point where four counties meet but there may be more: apparently just the one
Congratulations to r6paul for a speedy ftf, and commiserations to Riverboats for passing him on his return!