In 1885, Finland mistakenly built a lighthouse in Sweden, so its neighbor redrew the border to return it to them.

The Market Island It is most particular. How Guinness certifiesalong with Koiluoto, is the smallest uninhabited island shared between two nations: Sweden and Finland, once integrated into the Russian Empire (became independent in 1917but the history of Finland is another story). Unlike other islands with this casuistry such as Hispaniola (shared by Haiti and the Dominican Republic), its border is not more or less a straight line: It looks like an S, as you can see in the image that illustrates this article. The reason for this winding muga is a lighthouse.

As a curiosity, the Market lighthouse It had its lighthouse keeper in charge of managing it until it was automated in 1977, at which time the island became uninhabited, beyond tourists who came to visit its impressive fauna.

Located at the entrance to the Gulf of Bothnia in the Baltic Sea, Märket is halfway between the islands bordering the Swedish provinces of Uppsala and Stockholm to the west, and the Finnish archipelago of Åland to the east. The western part of the island is administered by Sweden and is also divided into two provinces: Uppsala and Stockholm. The eastern area corresponds to Hammarland, belonging to the Finnish autonomous territory of Åland.

Although the exact date on which Märket emerged from the sea is unknown, geology is based in the postglacial rebound rhythm of the region (greater than 5 mm per year) to point to the 16th century. Märket barely has 0.033 square kilometers, spread over a surface of mostly smooth diabase rock, with a maximum elevation of about 3.5 meters above sea level.

On its northern and southern coasts there are coves that serve as natural ports for small boats. To prevent ships from running aground on its reef, in 1885 the Tsar of Russia commissioned the construction of a lighthouse, designed by the Finnish architect Georg Schreck: the wayward Märket lighthouse. Stay with one piece of information: Schreck chose the highest point on the island to build it with all the sense in the world: it is the least exposed to waves and ice.

The Märket Island lighthouse has caused Sweden and Finland to change their borders

But before we go to 1885, let’s move to 1809, the moment when Sweden and the Russian Empire drew their borders in the Treaty of Fredrikshamn. According to this agreement, the borders would be fixed on geographical elements and the sea border would be fixed in the Åland Sea and the Gulf of Bothnia, with the islands assigned to the nearest country.

The topographical description of 1811 ruled: that line crossed Märket exactly through its geographical center. This original border can be revised in the historical archive Histdocwhich houses the official record:

Original Märket border. Official document of the governments of Sweden and Finland. Via Histdoc

You don’t have to pay much attention to observe an abysmal difference between the original border and the current one. Now it is time to travel back in time to 1885 when, after enduring the harsh climate (even in summer) of the island, the construction of the lighthouse was completed. Then two other attached buildings would arrive, a warehouse and a machine room. There was just one tiny, tiny problem.: They had planted it on the Swedish side.

Märket is (and always has been) an inhospitable island in the wilderness, not a place to pass through or stay. So no one bothered to solve this little problem until the 1980s. Specifically, the formal border demarcation process of 1979-1981 officially showed that the lighthouse was between 35 and 60 meters west of the central point of the islet: on the Swedish side. As you can see on the map, the buildings are marked in part B, entirely on the Swedish side.

So in 1985 they resolved it amicably. A joint Swedish-Finnish commission decided to modify the border so that the lighthouse was on the Finnish side through an exchange of territories, which generated that characteristic S shape. The maritime borders could not be modified without affecting the fishing areas, so they were limited to the land. Since then, the border has been marked with perforations in the rock itself (doing it any other way is not feasible due to its meteorological conditions) for almost 500 meters.

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Cover | Google Maps and tt_koski