Sykkylven Fjord Country: How Glaciers Carved the Hjørundfjord

How glaciers carved Hjørundfjord into a deep trench

Hjørundfjord is a masterwork of ice. During the last glacial period, which ended roughly 11,700 years ago, massive glaciers flowed down from the Sunnmøre plateau toward the sea. These rivers of ice, thousands of meters thick, moved with inexorable force through the valleys, grinding rock and deepening whatever waterways lay in their path. Unlike rivers, which carve V-shaped valleys, glaciers pluck at bedrock from above and below simultaneously, widening and deepening as they advance. The result is the characteristic U-shaped cross-section you see when looking across Hjørundfjord today: steep walls rising almost vertically from the water, with a relatively flat floor beneath.

The fjord extends approximately 20 kilometers inland from its mouth near Ålesund, reaching depths exceeding 400 meters in places. This extraordinary depth means the glacier that carved it was remarkably powerful and persistent. As the ice retreated and melted at the end of the ice age, seawater flooded the glacial valley, creating the fjord we navigate today. The sheer walls on either side preserve a record of that ancient erosion, telling the story of the ice age through geology you can see directly from the RIB.

Why the Sunnmøre Alps rise almost vertically from the water

The mountains framing Hjørundfjord are called the Sunnmøre Alps because of their dramatic vertical relief and alpine character. Peaks including Slogen, Råna and Kolåstinden rise sharply from near sea level to heights between 1,500 and 1,700 meters, often with less than 5 kilometers of horizontal distance between summit and shoreline. This extreme steepness is no accident: it results directly from the glacial carving that created the fjord. The glacier did not simply deepen one valley; it widened it substantially, plucking away the rock that once connected the high plateaus to the valley floor.

What remains are ridges and peaks of particularly hard bedrock that resisted the glacier's erosive power. These summits stand like sentinels because the softer surrounding rock was removed wholesale. The gneiss and other crystalline rock that forms the Sunnmøre Alps is also older and stronger than much of Norway's geology, contributing to the peaks' ability to maintain their vertical walls even as erosion continues today through weathering and water action.

Named summits and waterfalls you'll see from the RIB

Slogen dominates the western side of the inner fjord, its north face presenting a striking wall of near-vertical rock that catches the light as the day progresses. To the west, Råna rises with similar drama, its summit often wreathed in cloud. Between and below these major peaks, smaller mountains crowd the shoreline, each with its own geology and character. Kolåstinden, on the far side of the Norangsfjord arm, marks the fjord's southern reaches and often displays snow into early summer depending on the year.

Waterfalls cascade down the fjord's walls where streams have cut through the rock, fed by snowmelt and rainfall on the high plateaus above. The most significant falls appear in late spring and early summer when melt is heaviest, though water flows year-round from the permeable bedrock. Several side valleys open off the main fjord, each with its own character: some end in vertical cliffs, others in gentler slopes, depending on local geology and glacial history. Your guide will point out these features and explain the processes that shaped them, connecting what you see to the deeper story of the landscape.

Side valleys and how they reveal fjord formation

Hjørundfjord is not simply a single trench but a system of connected valleys, each telling part of the glacier's story. As you travel deeper into the fjord, smaller valleys branch off from the main channel. These tributary valleys were carved by smaller glaciers that fed into the master glacier occupying the main fjord. Some side valleys are dry above the waterline, their streams now flowing as waterfalls; others contain narrow arms of water that extend well into the mountains. Each side valley's depth and width depend on how long its glacier persisted and how much ice it contained.

The most dramatic side valleys end in sheer rock faces rising straight from deep water, indicating that glaciers occupied them until very recently in geological time. Others have gentler slopes and visible vegetation, suggesting that glaciers retreated from them earlier in the post-ice-age period. By examining these valleys from the RIB, you can read the sequence of glacial retreat that occurred over thousands of years, as climate warmed and ice masses shrank progressively.

Fresh water and salt water: why the fjord's surface is so calm

Fjords possess a unique water structure that explains their characteristically glassy surface. Freshwater from rivers, streams, and waterfalls is less dense than seawater, so it floats on top in a distinct layer. This freshwater barrier, which can be 5 to 10 meters thick depending on recent rainfall and snowmelt, sits atop the heavier salt water below. The boundary between these layers is called the pycnocline, and it acts almost like a physical barrier to wind mixing. Waves that might roughen the surface of an open ocean remain small and localized in a fjord because the upper freshwater layer is too thin and light to support large-scale wave development.

The result is the mirror-calm surface you experience on the RIB, especially on days with moderate weather. Sunlight reflects off this smooth surface with almost perfect clarity, creating the spectacular reflections of mountains and sky that make fjord photography so stunning. This calm is not merely aesthetic; it reflects fundamental physics. The freshwater layer effectively isolates the fjord's surface from the atmospheric mixing that creates waves elsewhere, and it also means the fjord's water temperature varies sharply with depth, influenced by season and recent weather patterns.

Why Hjørundfjord remains quieter than Norway's busier fjords

Geirangerfjord, Sognefjord, and other famous Norwegian fjords are reached by road and receive thousands of visitors daily, creating crowded conditions that transform the experience of being on the water. Hjørundfjord, by contrast, is reached primarily by boat from Ålesund, making it naturally less trafficked. No road runs the whole shoreline, and fewer tour boats navigate its waters, preserving a sense of wilderness and solitude. The sounds here are those of water, wind, and nature rather than competing vessel engines and the noise of crowds.

This quietness serves as a genuine advantage for understanding the landscape. Your guide's explanations are not drowned out by background noise, and you can hear the sound of waterfalls, sometimes the calls of sea eagles, and the subtle acoustic qualities of the fjord itself. The relative absence of heavy boat traffic also means the water remains clearer and less disturbed, allowing better visibility into the fjord's depths and a more authentic experience of the environment that glaciers carved thousands of years ago.

The ice age legacy: reading 11,000 years of landscape change

Standing in Hjørundfjord on the RIB, you are surrounded by evidence of one of Earth's most dramatic climate shifts. The landscape you see represents conditions at the end of the last glacial period, roughly 11,700 years ago, and the ongoing adjustments since then. The U-shaped valley, the vertical cliff faces, the waterfalls flowing from high plateaus, and the layered water column all tell part of this story. The bedrock exposed in the fjord's walls bears the scratches and gouges left by glacial abrasion, scars that will remain for millions of years as a record of ice's power.

As you travel from Keiser Wilhelms g. in Ålesund into the heart of Hjørundfjord, you move backward through time in a sense, seeing progressively less altered landscape and more recent glacial features. The inner fjord retains characteristics of recently deglaciated terrain, with loose rock, steep slopes still adjusting to exposure, and active erosion by water and ice. Your guide interprets these features, explaining how the landscape continues to change today through weathering, rockfall, and the slow isostatic rebound of the land as it recovers from the weight of ice that once pressed down upon it.

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