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 Struve who first carried out an accurate measurement of a long segment of a meridian, which helped to establish the size and shape of the Earth. Originally, there were 265 station points. The UNESCO World Heritage Site includes 34 points in ten countries (north to south: Norway, Sweden, Finland, Russia, Estonia, Latvia, Lithuania, Belarus, Moldova, Ukraine), six of which are in Finland. Alatornio Church, one of the station points in Finland, is pictured.