GlommaDyppen

Glomma River, Fetsund, Viken, NO

At a glance

Last edition date
August 1, 2026
Distances
2 km · 6 km · 11 km
Where
River · Glomma River, Fetsund, Viken, Norway
Wetsuit
Water temperatures in the Glomma River can fluctuate significantly, dropping from 17-18°C (63-64 °F) to around 10°C (50 °F) within a few days.
Registration
glommadyppen.no
Organizer
GlommaDyppen

About the race

On September 13, 1905, the Fetsund Battery was fully mobilized with 1,450 men stationed to defend the vital river crossing against potential incursions. Today, the strategic silence of this former fortification offers a backdrop for a very different passage, as swimmers take to the waters of the Glomma River to traverse the same currents that once dictated the movement of troops and trade. The Glomma, Norway’s longest and most powerful waterway, creates the largest inland delta in Northern Europe here, providing a unique navigational challenge for those entering the water at Fetsund.

{{h2:The river environment}}

As you begin your race, the landscape reveals the remnants of the 1862 railway bridge, a 440-meter structure that once stood as the longest in the country. This concrete and steel legacy anchors the historical context of the swim, leading athletes past the Fetsund Lenser site. Here, a 7-meter high millennium marker stone records the extreme flood levels of the past, a silent indicator of the river’s immense energy. The course winds through a region rich in human history, where the banks near the Riddersand school house the 'Ridderhaugen', a substantial burial mound from the Iron Age, and the Fet rectory grounds contain traces of activity reaching back to the Stone Age.

{{h2:Race day mechanics}}

Participants can choose between 2km, 6km, and 11km distances, with the event scheduled for August 1, 2026. Because the Glomma is a dynamic river system, it occasionally experiences rapid shifts in conditions; organizers monitor these changes closely to manage the logistics of the crossing. The river's flow and temperature characteristics are central to the experience, demanding a respectful approach to the water's natural variability. The event is part of the Marathon River Swim Series, providing a structured venue for long-distance river racing that emphasizes stamina and navigation through a complex delta ecosystem.

Course

River swim in the Glomma, with varying water temperatures and currents.

Entry fees

31–67 €

Regulations

Water temperatures in the Glomma River can fluctuate significantly, dropping from 17-18°C to around 10°C within a few days.

Previous editions

Organizer

GlommaDyppen

Official site

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Useful info

The race takes place in the Glomma River. Water temperatures can fluctuate rapidly (from 10°C to 18°C). The 6km times serve as a seeding for the 3km Vansbrosimmet. It is recommended to monitor the website for updates regarding wetsuit and safety requirements.

Frequently asked questions

When was the last edition of GlommaDyppen?
The last edition of GlommaDyppen took place on August 1, 2026.
What distances does GlommaDyppen offer?
GlommaDyppen offers 2 km, 6 km, and 11 km.
Is a wetsuit required at GlommaDyppen?
Water temperatures in the Glomma River can fluctuate significantly, dropping from 17-18°C (63-64 °F) to around 10°C (50 °F) within a few days.
Where does GlommaDyppen take place?
GlommaDyppen is a river swim. Location: Glomma River, Fetsund, Viken, Norway.
How do I register for GlommaDyppen?
The reference page for registering for GlommaDyppen is https://www.glommadyppen.no/en/.

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