On a kayak at Akerselva in Oslo, Norway 

I'm going down Akerselva in Oslo, where I met a family of swans and got warned to stay away.
The wooden boats belong to akerselvatrebaatforening.org
The river tunnel is curved and about 500 meters long. The last stretch is illuminated, but my advice is to bring a lantern to see where you're going anyway. Also, keep to the left, as the right inlet is more difficult to trasverse, not to mention that passage is prohibited.

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