thumb|right|Tartu Old Observatory, the first point of the arc.
thumb|right|Point Z, situated on [[Gogland|Hogland, Russia.]]
thumb|alt=alt text|The commemorative plaque of the arc in Felshtyn, Ukraine
thumb|right|The Geodetic Point in Rudi, Moldova
The Struve Geodetic Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through ten countries and over , which yielded the first accurate measurement of a meridian arc. The World Heritage site includes 34 commemorative plaques or built obelisks out of the original 265 main station points which are marked by drilled holes in rock, iron crosses, cairns, others.
The measurements of the 30° Meridian Arc in 1816–1852 as well the description of the geodesic, topographical, and map making works in the Balkans from the nineteenth century until the beginning of the twentieth century by Russian Czarist Army was described in Astronomy, geodesy and map-drawing in Moldova since the middle ages till the World War I.
Chain
Norway
- Fuglenes in Hammerfest ()
In 2005, the work was repeated using satellite navigation. The new flattening estimate was one part in 298.257 222 101 and the equatorial radius was .