Are you sure? Looking here the strip seems to be less than half that width, and mostly water.
A couple of other “nearlies”
Armenia and Iran have a border East of the Azerbaijani enclave of Nakhchivan. West of it, they’re separated by a thin strip of Turkey.
Nigeria and Chad have a border, but only over water (Lake Chad). On land, they’re separated by a strip of Cameroon.
At the top of the Gulf of Aqaba, not only is Jordan separated from Egypt by less than 10kn of Israel, but Israel is separated from Saudi Arabia by about 20km of Jordan.
Then you have the 4 corner states UT,CO,NM,AZ with the opposing corners mathematically only joined by a dimensionless point, not even enough to pass a joint from CO to AZ without running afoul of laws in NM and UT if one tried to use that point to exchange the hit.
Well, that part is a bit weird. They look like lagoons or something, not open water. I measured from the border to the actual coast, and it’s about 1.8 miles there.
That seems to be a “nearly” that has turned into a “really”. Lake Chad looks pretty dry in this satellite image. Certainly there seem to be plenty of dry dunes bisected by the border, with small stretches of water in between.
In fact both of the tripoints in Lake Chad now seem to be on dry land.
But it is basically turned into a de-facto wildlife preserve. And I doubt there will be any significant development anywhere along the corridor.
Looked it up on wikipedia, and the estimated width of the DMZ is 4 KM (or 2.5 miles).
The wiki article indicates that there are a few buildings that exist right on the line, that are accessible by representatives of North and South Korea, and the table in the room has a line on it. (Sort of like when Greg got into a fight with Peter and Bobby, so they put a piece of masking tape down on the floor. Oh, those crazy Brady’s!)
Also, an interesting tidbit… North Korea claims there is a wall that has been constructed between the two countries, but South Korea & the US deny the wall exists. From the NK side, you can see the wall, but from the SK side, it looks like a hill. No wall is visible. The wiki page has a picture supposedly taken from NK that shows the wall does exist. (I’d link to all this, but I suffer from a perma-crashing issue when I try to insert links, so I’ve given up).
Considering they’re islands, you can make a plausible argument that France and Canada are separated by a twelve mile wide stretch of water.
Thereby raising an interesting trivia question: Rank these three countries by how close they are to France at their nearest point: Brazil, Canada, the United Kingdom.
Hong Kong (former UK colony) and Macau (former Portuguese colony) are separated by a mere 37km of the South China Sea, and since they’re both now “Special Economic Zones” of China, it probably still counts.
Since it was mentioned earlier, I didn’t include it.
However, Wiki has the distance wrong. Google maps indicates the shortest distance to land that is part of Canada is only five miles, between St. Pierre and tiny Green Island.
The shortest distance between the UK and France appears to be about 14 miles from Jersey to Normandy, so that would beat the distance listed for St. Pierre by Wiki.
Correction. If one accepts overseas territories, the closest seem to be Anguilla (UK) and the French part of St. Martin, which are only about 4.5 miles apart.