The Struve Geodetic Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea (designated an UNESCO World Heritage Site in 2005), about which I wrote here. Two of the geodetic points are located in Russia, both, i.e. Maki-Paalys Point and Z Point, on the small Hogland Island in the Gulf of Finland, at about 180 km west from Saint Petersburg and 35 km from the coast of Finland. The two points were established on the hill Mäkiinpäällys in 1826, and in memory of the historic event, here were placed two memorial plaque.
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