In Baarle there are front doors with two house numbers, one Belgian and one Dutch. Where the border runs through the entrance, the position of the door decides which country the residents live in. Rebuild, and you can change country without moving house.
It sounds like a joke of history. It is the opposite: the precise result of treaties that nobody was willing to reopen. Baarle-Hertog and Baarle-Nassau share one built-up area in which Belgian enclaves sit on Dutch soil, and inside some of them Dutch counter-enclaves sit again. The division goes back to medieval landholding, written down parcel by parcel in the 1843 Treaty of Maastricht instead of being straightened out. One town centre, two mayors.
That is exactly where the pattern lies. Absurd borders almost never come from caprice. They appear when two sides cannot agree and the solution is to freeze the dispute rather than settle it.
“Strange” here is a judgement, not a measurement. The three places in this piece are an editorial selection, not a ranking: they are here because the frozen compromise shows up in them particularly clearly. There is no complete list of the world's oddest borders, and anyone who draws one up is sorting by taste.
A border only looks absurd until you know what the argument was about.
— TerraTally · Borders desk
Three compromises you can still see today
The station standing in two countries. In Basel a platform area sits on Swiss soil while falling under French law. It follows from a railway line being built before it was settled who would run it. Travellers change legal territory there by walking through a door. The border lies not in the landscape but inside the station building, and it works only because two administrations respect it every day.
The border running through a building. Between France and Spain, between Canada and the United States, between Belgium and the Netherlands there are houses standing on both sides. Almost all of them are older than the survey that cut them in two. None was demolished for it. Sharing jurisdiction is cheaper, and so two authorities end up under one roof that its residents never asked for.
The village with no road home. Along the India-Bangladesh border more than 150 enclaves existed until 2015, some of the third order: Indian land inside Bangladeshi land inside Indian land. They were dissolved only by a territorial exchange negotiated over decades. Until then people lived there who could not reach a single authority of their own state without crossing another country. They pushed for that exchange long before it came about.
By the numbers
1843
Treaty of Maastricht
2
Mayors in one town
2015
Land swap India and Bangladesh
What connects these places is not the curiosity but the upkeep. Every one of these lines is maintained: land registries keep them current, municipalities organise their administration around them, people arrange their daily lives by them. A border is not a line on a map. It is an agreement kept afresh every day.
And that is precisely why these borders survive. Straightening them would mean reopening the old argument. The compromise is uncomfortable. It holds.