EVERY YEAR, AN ESTIMATED 20,000 DIVERS head to Iceland to cross off their travel to-do list one of its biggest items: diving between 2 continents and actually touching them both underwater at the same time. Silfra fissure is a crack that separates the Eurasian and North American continents, located in the heart of Thingvellir National Park, a UNESCO world heritage area. Its crystal clear water, with an average temperature of 35ºF year-round, comes from Langjökull glacier and has traveled close to 100 years through lava rock to get to the fissure. The result? On a clear day, divers have perfect visibility of the bottom of Silfra, 206 feet deep, as can be seen on this video by Dive Iceland.