May 20th Brønnøysund
The hatlike mountain with the hole through is one of the most striking geological formations in Norway as well as one of the most visited attractions. Even if I´ve been there before I thought it would be well worth a second trip, especially in really nice weather. And of course the trip got microscopical more expedition like since I hade to pedal my collapsible bike to the foot of the climb and back.
According to a fairly official website it is 18 km from Brønnøysund and a 250 m climb when you get there. The trip meter on my smartwatch had it at 13 km and 110 m climb.
The hole of tunnel is formed at the end of an ice age when sea levels was higher than today. Waves in combination with frost weathering worked on a weaker part of the rock and over time hollowed out caves from both ens of the mountain. Eventually the caves met and formed a tunnel.
Sources are unclear on when the hole was formed. Most just states an ice age and a few points to the last. However the official maps of the maximum height of the sea after the last ice age (important level to chart to be able predict quick clay areas with high risk of deadly landsides) has the hole above the level of the sea indicating that the hole is from an older ice age.
At the foot of the climb an information sign told that it is possible to go around the mountain by foot or bike so I did.
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