Silfra, in Þingvellir National Park in Iceland, is where the Eurasian and North American continental plates are dividing. It’s a crack in the earth where you can snorkel or dive between the continents. Well, sort of. As ever, it’s a bit more complicated than that.
Þingvellir history: https://www.thingvellir.is/en/history-nature/history/
An interoduction to divergent plate boundaries: https://geology.com/nsta/divergent-plate-boundaries.shtml
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