Päijänne Water Tunnel

Rarity: Common

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What Wikipedia says

The Päijänne Water Tunnel (Finnish: Päijännetunneli, Swedish: Päijännetunneln) is a water tunnel located in Southern Finland. At 120 kilometers (75 mi), it is the second-longest tunnel in the world, running at a depth of 30–100 metres (100–330 ft) in the bedrock.

Excerpt from the Wikipedia article “Päijänne Water Tunnel”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Geralt Riv, CC BY-SA 4.0, via Wikimedia Commons.