Struve Geodetic Arc* in Khmelnytskyi Oblast, Odessa Oblast.
The Struve Geodetic Arc is a series of triangulation points, stretching over a distance of 2,820 kilometres (1,750 mi) from Hammerfest in Norway to the Black Sea. The points were set up in a survey by the astronomer Friedrich Georg Wilhelm von Struve who first carried out an accurate measurement of a long segment of a meridian, which helped to establish the size and shape of Earth. Originally, there were 265 station points. The World Heritage Site includes 34 points in 10 countries (North to South: Norway, Sweden, Finland, Russia, Estonia, Latvia, Lithuania, Belarus, Moldova, Ukraine), four of which are in Ukraine (site marker in Felshtyn pictured).