Draw a national border and you expect a clean line: my land on this side, yours on that. Most of the world's frontiers behave. But scattered across the map are places where the logic folds in on itself — a whole country surrounded by a single neighbour, a scrap of one nation stranded deep inside another, and, in one astonishing case now erased, a plot of land belonging to one country, inside a plot belonging to a second, inside a plot belonging to the first, inside the second. Geography's neat lines hide some very strange knots.
Start with the simplest oddity: the country completely surrounded by one other country. There are only three true examples in the world. Lesotho, a mountainous kingdom, is entirely encircled by South Africa. San Marino and Vatican City are both wholly enclosed by Italy. These are the enclaved states, sovereign nations with a single land neighbour and no coast, dependent on that neighbour for road and air access to the wider world. Vatican City doubles as the world's smallest sovereign state, at about 44 hectares — smaller than many city parks — and San Marino claims to be among the oldest republics, tracing its foundation by tradition to the year 301.
Enclave and exclave — the words matter
Quizzes love the vocabulary here, and it repays getting right. An enclave is a territory entirely surrounded by another single state. An exclave is a piece of a country that is physically separated from the main body of that country, cut off by foreign land. The two often describe the same patch from different angles: a fragment can be an exclave of the country it belongs to and an enclave within the country that surrounds it. Not every exclave is an enclave — Alaska is an exclave of the United States, separated by Canada, but it borders the ocean and is not hemmed in by a single state, so it is not a true enclave. The classic textbook case is Büsingen, a German village entirely encircled by Switzerland, or Campione d'Italia, an Italian town wrapped in Swiss territory on the shore of Lake Lugano.
Spain and Morocco supply another set: Ceuta and Melilla are Spanish cities on the North African coast, exclaves of Spain bordered by Morocco. And the tiny Spanish town of Llívia sits marooned in French territory in the Pyrenees, separated from Spain by a couple of kilometres of France — a leftover of a seventeenth-century treaty that handed France a batch of villages but, because Llívia ranked as a town rather than a village, left it stranded on the wrong side.
One more curiosity belongs in the collection. The Belgian town of Baarle-Hertog and its Dutch neighbour Baarle-Nassau are laced together into what is often called the most complicated border on Earth: 22 Belgian parcels sit inside the Netherlands, several of them containing counter-enclaves of Dutch land in turn. The frontier runs through gardens, cafés and front doors, marked by crosses set into the pavement, and a house's nationality has at times been decided by which country its front door opens onto.
The knot at Cooch Behar
All of this was mere tidiness compared with the border between India and Bangladesh around Cooch Behar. There, for centuries, lay one of the most tangled frontiers ever recorded: a confetti of enclaves, said to number well over a hundred, created by old treaties and, by legend, by chess-like wagers between local rulers. Indian villages sat inside Bangladesh; Bangladeshi villages sat inside India. Tens of thousands of people lived in these pockets, many effectively stateless, unable to reach their own country without crossing another. The area contained the only known third-order enclave on the planet: a plot called Dahala Khagrabari, a patch of India, inside a Bangladeshi enclave, inside an Indian enclave, inside Bangladesh. A farmer could, in principle, own a field that was his nation's territory surrounded by three nested rings of alternating sovereignty.
The absurdity was finally cut in 2015. India and Bangladesh ratified a Land Boundary Agreement and simply swapped the enclaves, exchanging more than 150 of them and allowing residents to choose their citizenship. Dahala Khagrabari, the enclave-within-an-enclave-within-an-enclave, ceased to exist with a stroke of the pen — one of the rare occasions when the world's map got genuinely simpler.
Borders feel like facts of nature, permanent as coastlines. They are nothing of the sort. They are agreements, and agreements can tie themselves in knots no river ever would — and, just occasionally, untie them.
Quiz nuggets
- Only three countries are entirely surrounded by a single other country: Lesotho (by South Africa), San Marino and Vatican City (both by Italy).
- Vatican City is the world's smallest sovereign state at roughly 44 hectares.
- An enclave is territory surrounded by one state; an exclave is a detached fragment of a country — Alaska is a US exclave but not an enclave.
- Ceuta and Melilla are Spanish exclaves on the North African coast bordered by Morocco.
- Dahala Khagrabari, on the India–Bangladesh border, was the world's only third-order enclave until the 2015 land-swap dissolved it.