Mustaviiri is an island in the Gulf of Finland National Park. The island is a treasure trove of cultural history sites, such as the southernmost Finnish station point of the Struve Geodetic Arc. The point was established in 1833 and is marked as drill hole in bedrock. Next to the station point there is an observation tower and the remains of the old triangulation tower.
Unesco: Struve Geodetic Arc
RR: Finland x world RR
Date: Dec 26
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