Fissure Snorkeling in Lake Silfra in Thingvellir National Park City: Reykjavik - Duration: 4 hours Grab the chance to snorkel the pristine waters of Lake Silfra, one of the world's top 10 diving sites. Visibility in this glacial water is as clear as you'll get! and where else in the world can you go snorkeling between two continents? more...