The Norwegian fjords are among the world's most stunning natural features, created by glaciers over millions of years. A fjord is a deep, U-shaped valley formed by glacial ice and later inundated by the sea, resulting in narrow, steep-sided inlets that can fall to depths of over 1,300 meters. These spectacular structures were carved during the Quaternary Period, which began about 2.6 million years ago, continues today, and has seen ice sheets and outlet glaciers rise and retreat repeatedly.
The formation process reveals nature's amazing patience and force. During glacial ages, gigantic ice sheets—sometimes over 2,000 meters thick—eroded the bedrock, resulting in over-deepened valleys beneath sea level. The roughly 500 meters per year cited by University of Bergen researchers refers to modern channelized ice flow in Antarctica and Greenland, not to the rate at which Norwegian bedrock was worn away. The Sognefjord, Norway's longest and deepest fjord, demonstrates this process, with depths of 1,300 meters and a threshold of 100 to 200 meters. As the Scandinavian Ice Sheet retreated, seawater occupied these deeply eroded valleys. The retreat was regionally progressive and continued into the Holocene epoch, rather than ending everywhere at its beginning around 11,700 years ago.
Norwegian fjords are particularly magnificent due to their recurrent creation throughout numerous glacial cycles. Once U-shaped valleys are formed, they funnel ice in subsequent glaciations, effectively propagating themselves and deepening with each cycle. The convergence of tributary fjords resulted in the excavation of the deepest basins, but glaciers along the shore dispersed out through sounds and low valleys, losing concentration and erosive strength, leaving bedrock thresholds. The western Norwegian fjords Geirangerfjord and Nærøyfjord form the serial UNESCO World Heritage property “West Norwegian Fjords”, inscribed in 2005 with breathtaking landscapes with towering cliffs, tumbling waterfalls, and pure waters.
