Isdammen – Oslo’s Forgotten Ice Lakes Hidden in the Forest

Tucked deep inside Nordmarka, just a short trip from central Oslo, Isdammen is a series of old ice lakes once used to harvest ice for export across Europe in the pre-refrigeration era. During Norway's ice export boom of the 1800s and early 1900s, these artificial lakes were crucial infrastructure where winter ice was cut into blocks, stored in insulated warehouses, and shipped to cities across Europe. Stone dams were constructed to control water levels and create optimal freezing conditions, while elaborate systems of channels, sluices, and storage buildings handled the harvest. Today, moss-covered walls, crumbling stone dams, and rusted iron hooks still remain, slowly being reclaimed by the forest in atmospheric decay.

Weathered wooden remnants of storage structures peek through undergrowth, and the engineered landscape of dams and channels is still clearly visible despite nature's encroachment. Despite its proximity to the city (reachable via metro to Frognerseteren and a 30-40 minute walk), the area feels silent and abandoned, preserving an unexpected sense of wilderness history. Mirror-like water surfaces reflect surrounding pine and birch forest, and narrow trails weave between history and wilderness, past interpretive signs explaining the ice industry. Few Oslo residents know this place exists, making it a peaceful escape even on busy weekends.

The area is excellent for families, offering easy walking on mostly flat terrain with fascinating industrial archaeology to explore. Combine with a visit to the nearby Sognsvann lake or extend to a longer Nordmarka forest walk. Accessible year-round, though summer and autumn offer the most pleasant conditions. Winter brings its own irony—visiting the ice lakes when frozen solid, imagining the workers who once labored here in temperatures far colder than modern Oslo winters. The site is free to visit and offers picnic spots with historical atmosphere.