Iceland has pioneered the control of Jökulhlaups, catastrophic glacial outflow rivers, in Skaftafell National Park, by being familiar with the land enough to copy its models.
In addition to the deflective butts of rock redirecting Bæjargil as it streams down from Svartifoss, the Black Falls, there’s a troll in the stream bed. There usually is. That’s the spirit of the rock, just as the water-deflecting dikes are in the distance. What? Did someone tell you that trolls are mythological? No, they are us.