Korpinkierros Trail, Haukkalampi (Nuuksio National Park)

Korpinkierros is the longest of the marked loop trails that start from the Haukkalampi trailhead in Nuuksio National Park, in Espoo in the Uusimaa region of southern Finland. The trailhead is at Haukkalammentie 32, about 35 km from central Helsinki. Visitors without a car can take an HSL train to Espoo station and then bus 245 or 245A towards Nuuksio, getting off at Punjonsuo or Nuuksionpää and walking the remaining distance. There is a car park at Haukkalampi, and national park entry is free; no permit is needed for day hiking. The loop measures about 8 km and usually takes around four hours at an unhurried pace. Elevation gain is modest in absolute terms, but the route rises and falls repeatedly over rocky ridges, so the cumulative effort is greater than the distance suggests. The surface is a mix of packed forest soil, tree roots, bare granite slabs and short sections of duckboard across wet ground. Slabs become slippery after rain and in frost, and sturdy footwear with good grip is advisable. Tree cover is dense over most of the loop, offering shade in summer, while the exposed ridge tops give views over the forest and small lakes typical of Nuuksio. Landmarks include old-growth pine, clear forest ponds and the lakeshore at Haukkalampi itself, where the loop can be shortened by returning to the trailhead. The shorter Haukankierros and Punarinnankierros loops share the same starting area, so walkers who tire can switch to a shorter route. Water is not reliably available on the trail, so visitors carry their own. Fires are permitted only at marked cooking sites in the park. The park's services, including a nature centre, are located elsewhere in Nuuksio, and the trail itself has no staffed huts. Because the route is well signposted, navigation is straightforward, although an offline map or the trail map from Luontoon.fi is useful as a backup. Winter visits are possible with warm layers and appropriate footwear, when the same ridges are covered in snow.