Iceland is known for its remarkable geological features. The island is located at the meeting point of the North American and Eurasian tectonic plates, which explains Iceland's significant volcanic and seismic activity. Less than an hour's drive from Reykjavik, Thingvellir (Þingvellir) National Park is where you can admire this junction between continents. This area is a collapsed valley, or graben, located at a place where two plates are drifting away from each other. As a result, its landscape has many faults, some of which are underwater.
To observe this geological curiosity more closely, dive in Thingvellir National Park’s Silfra fissure. You’ll need a wetsuit to swim in these waters as temperatures are barely above freezing. But these low temperatures, which stem from the filtering effect of the volcanic rock, also make the water extremely clear.
Once underwater, get close up and admire newborn rocks in the surreal canyons and tunnels that await you. The most impressive underwater monument here is the Silfra Cathedral, which is 328 feet long and 207 feet deep.See more