Plizio Visual Lab

Korouoma Valley

Plizio editorial teamUpdated: Jun 2026Data Sources

valley

Weather…

Korouoma Valley is a spectacular fracture valley in the municipality of Posio, southeastern Lapland. It extends for about 30 kilometers and is incised about 130 meters deep into the surrounding terrain at its deepest point. Geologically, it is a fault zone hundreds of millions of years old in the Precambrian bedrock, further deepened by the erosion of ice ages. The valley is particularly famous for its massive ice falls that form on the steep rock faces in winter, attracting climbers from all over the world. In summer, the canyon features a diverse landscape of dense forests, bubbling streams, and rugged cliffs. The flora and fauna in the valley are diverse, as the sheltered location creates a slightly milder microclimate than on the surrounding highlands. A marked hiking trail runs through the central part of the canyon, providing insights into the region's dramatic geology. The area is designated as a nature reserve to preserve its unique geomorphological formations.

Location: Finland
Nearby: Posio (32 km)

Best time to visit & climate

The most pleasant time to visit is Jun–Aug.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg °C	-13	-12	-7	-1	6	12	16	13	8	1	-5	-10
Rain mm	51	40	44	50	82	91	109	95	86	73	63	60

📋 Practical info

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Getting there

Reached dependably via roads in the Posio region, where well-marked signs clearly guide all visitors to the main, accessible starting points for the deep canyon trails.

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Best season

Winter is absolutely world-famous here for spectacular ice climbing on frozen waterfalls, while the summer beautifully reveals a lush, deep green river canyon for hiking.

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Terrain & paths

The dramatic landscape is primarily characterized by a deep geological fracture valley with immensely steep, rocky canyon walls and a cascading river at the very bottom.

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What to bring

In the icy winter, ice cleats or crampons are absolutely mandatory, while the summer reliably requires sturdy hiking boots for the notably uneven and rocky paths.

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Parking

There are widely designated and spacious visitor parking lots at the top edges of the canyon, from which the trails then descend quite steeply down into the valley.

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Safety

Extreme caution is required near the exposed edges of the canyon and closely around the frozen waterfalls, where unexpectedly falling ice is a very real hazard.

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Time needed

Exploring the entire main canyon route comprehensively usually takes about three to five hours, depending heavily on the specific trail conditions and the amount of snow.

Geography

Coordinates

66.20000, 27.50000

Facts

The total length of the Korouoma Canyon is approximately 30 kilometers.
The maximum depth of the valley is around 130 meters.
There are at least 14 named ice falls used for climbing in winter.
The valley was established as a nature reserve in 1996.
Geologically, the valley is part of a fault line hundreds of millions of years old.
The Koronjää trail is a popular 5 km circular hiking route in the valley.