🪨 Märket Island (Finnish: Märketin saari, Swedish: Märket) is a tiny rock in the Baltic Sea, covering just around 3.3 hectares. It lies in the Söderarm? Wait need keep accurate. User says проливе Сёдра-Кваркен between Sweden and Finland. Translate. It is considered the world’s smallest island officially divided between two states.
But Märket’s most remarkable feature is not its size — it is the border line that runs across it.
In 1809, after the war with Sweden, Russia took control of Finland. The border between Sweden and the Russian Empire was drawn straight across the island — neat, geometric, perfectly split in two. On the map, it looked tidy and logical. 📍
The problem emerged in 1885. Authorities in the Grand Duchy of Finland built a lighthouse on the island, since navigation in those waters was dangerous and shipwrecks were common. Maps at the time were imprecise, and the lighthouse was accidentally placed on the Swedish half of the island.
That created an odd situation: formally, the lighthouse stood on Swedish territory, but it was maintained by the Finns — first as part of Russia, and later by independent Finland. For nearly a century, no one saw much of a problem in this. The island was uninhabited, there was no permanent population, and there was little to argue over.
In the 1970s, the lighthouse was automated, and in the early 1980s, as the border was being re-surveyed, geodesists noticed the old mismatch. In 1985, the two countries agreed to adjust the line. Instead of a straight border, they drew a neat zigzag — one that bends around the lighthouse in an elegant little snake-like curve. 🗺️
The lighthouse ended up entirely on the Finnish side, while Sweden did not lose a single square meter: Finland transferred an equal-sized piece of land elsewhere on the island. The balance was preserved, and neither side’s territorial sensitivities were touched.
Today, the lighthouse is automated and operates without permanent staff. Märket is visited mainly by ornithologists, lighthouse enthusiasts, and collectors of unusual borders.
Märket is not just an island — it is also an example of how territorial issues can be resolved without conflict.
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