Bjurälven, Nature reserve in Jämtland, Sweden
The Bjurälven nature reserve contains a river that flows underground through limestone caves for three kilometers before resurfacing downstream in the valley.
In 1979, cave explorer Bo Lenander identified a significant underwater cave entrance at the bottom of Dolinsjön lake, marking the start of systematic exploration.
The Swedish Speleological Society conducts annual winter expeditions to map and document the extensive underwater cave network within the reserve.
Diving operations require cutting through thick ice, setting up heated tents, and managing multiple air tanks in temperatures that reach minus twenty degrees Celsius.
The reserve contains three hundred dolines, including Snödolinen, a fifty-meter-wide depression that retains snow throughout the year.
GPS coordinates: 64.93311,14.12545
Latest update: March 3, 2025 00:16
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