The Suomenlinna Fortress Island, located just outside the city center of Helsinki, is a World Heritage site that was constructed as protection against Russian expansionism in the  mid 18^th century.  Suomenlinna (or Viapori or Sveaborg) comprises of eight islands, and it is a popular tourist attraction, but also enjoyed by the local population of 900 permanent inhabitants. 

Besides the rich history and culture, Suomenlinna provides an excellent opportunity to observe the crystalline 1.9 Ga old rocks that were deformed and metamorphosed during the Svecofennian orogeny.

During the walk-around – excursion, we will visit the glacially polished shoreline outcrops of the Suomenlinna island, where we will get insight into which types of ductile and brittle fabrics were developed into the rocks during and right after the ancient mountain-building processes. 

Furthermore, we will learn how these structures  subsequently contributed to the glacial erosion that finally shaped the islands into their present-day shape.

The duration of the walk is 2,5 hours and its length is approximately 5 km. We recommend wearing comfortable shoes and warm clothing. Please note that this field trip is not wheelchair accessible.

IMPORTANT: Make sure you pick up your complimentary ferry ticket at the registration desk, on Wednesday from 08:30 to 16:00.