The Struve Geodetic Arc is a chain of survey triangulation points that stretch from Hammerfest in Norway all the way to the Black Sea. The imaginary lines go through ten countries and over 2,820 kilometres. Carried out between 1816 and 1855 by the astronomer Friedrich Georg Wilhelm Struve, this survey represented the first accurate measuring of a long segment of a meridian, helping establish the exact size and shape of the planet. Sweden has seven measurement points and four of them are on the World Heritage List (on the mountains Tynnyrilaki, Jupukka, Pullinki, and Perävaara). The mountaintop unveils an expansive view.

Venture 27 kilometres north of Arrecife to discover some of the world's most awe-inspiring caves. The Jameos del Agua subterranean complex, formed 3,000 years ago by a volcanic eruption, boasts an array of volcanic formations, including lakes, caves, courtyards, and even a subterranean auditorium that regularly hosts concerts. Adjacent to Jameos del Agua, you'll find the remarkable Cueva de los Verdes, a lava tube situated within the protected area of Monumento Natural del Malpaís de La Corona. This tourist attraction features 7-kilometre-long tunnels and a mesmerising subterranean lake in its largest cave.

The Tärendö River stands as the second largest bifurcation in the world, stretching over 52 km with a significant vertical drop of 35 metres. Known for its impressive nine rapids, this river system showcases the natural beauty and dynamic water features that contribute to the unique landscape of the region.