Sights at Korouoma Nature Reserve

In Korouoma the route between Pirunkirkko and Julmakallio is closed from visitors. The stairs in the route are in very bad condition.

There is a beawer living in the area between Pirunkirkko and Julmakallio. It has caused flood and the river bank has collapsed on some parts. A couple of bridges have fallen down. The route is available when turning away from the path from afar and across the beawer dams. Rubber boots or waterproof hiking shoes are recommended.
Saukko-oja stream in Korouoma. Photo: Minna Koramo.

Revontuliputous. Photo: Pekka Veteläinen In the mid-part of Korouoma, below the surrounding terrain, the fracture valley forms a gorge, whose cliffs are steep and, in places, vertical and dozens of metres high.

In the winter, the small streams pouring down the cliffs become frozen waterfalls. They remain frozen until late spring. Precipitation and sub-zero temperatures determine the number and shape of frozen waterfalls. Most people are happy to just admire the frozen waterfalls, but enthusiastic ice climbers climb up the frozen waterfalls to the top, despite the intensely cold weather.

You can see the frozen waterfalls at Korouoma by hiking the Koronjää Day Hiking Trail clockwise:


The ice in Revontuliputous (the Northern Light Fall) is often flaky and the ice layer thin, as the water usually only runs in late autumn.

  • Height of the wall: about 40 metres
  • Width of the wall: 5-10 metres
  • Steepness of the wall: 80-90 degrees

Tuulen tie

Tuulen tie. Photo: Pekka Veteläinen

Tuulen tie (the Winds Way) has thin, finger-like formations of ice, most of them vertical. It is not suitable for climbing every winter.

  • Height of the wall: about 40 metres
  • Width of the wall: 80-100 metres
  • Steepness of the wall: 85 degrees

Jaska Jokunen

Jaska Jokunen. Photo: Pekka Veteläinen

The water usually only runs to the Jaska Jokunen (Charlie Brown) icefall in late autumn, and the ice is thin and flaky most years. Some winters, the middle section of the wall turns into an ice cave that lends itself to an adventurous overnight stay.

  • Height of the wall: about 50 metres
  • Width of the wall: 20-60 metres
  • Steepness of the wall: 50-90 degrees


Onnekas. Photo: Pekka Veteläinen

The Onnekas (Lucky One) icefall forms infrequently. It is located about 100 metres upstream along the River Korojoki from Mammuttiputous (the Mammoth Fall). 

  • Height of the wall: about 50 metres
  • Width of the wall: 20-25 metres
  • Steepness of the wall: 80-90 degrees


Mammuttiputous. Photo: Pekka Veteläinen

Mammuttiputous (the Mammoth Fall) is one of the most popular climbing spots at Korouoma. The wide frozen fall offers several climbing routes of various levels of difficulty. The right side of the icefall is some 50 metres high, and the width varies from year to year. The brook that creates the ice originates on the slopes of Yli-Voho Hill. Most of the brook's clear water comes from a spring, which gives the ice sheet its distinct blue colour.

  • Height of the wall: about 35-50 metres
  • Width of the wall: 40 metres
  • Steepness of the wall: 50-90 degrees

Ruskea virta

Ruskea virta. Photo: Pekka Veteläinen

Ruskea virta (Brown River) at Piippukallio is Korouoma's largest and highest icefall. As the highest frozen waterfall at Korouoma, it poses a challenge even for more experienced ice climbers. The middle area routes rise to about 60 metres. The water flow is strong all through the winter, and if the frost sets in early, you can go climbing at the turn of October and November. The last pieces of ice usually disappear at the turn of May and June.

  • Height of the wall: about 35-60 metres
  • Width of the wall: 40 metres
  • Steepness of the wall: 70-90 degrees

More information on Korouoma from the Posio Tourist Information website (

Korouoma's Frozen Waterfalls Brochure

(Pdf file, 430 Kb)