What about snorkeling between 2 different continents? Jonathan and I just successfully did it at the Silfra Fissure in Iceland which is considered as the clearest water on earth! It's a crack between the North American and Eurasian Continents! One of the awesome things to do with your love of your life!
Silfra's clear water attracts scuba divers and snorkelers. Located in the Pingvellir National Park in Iceland, Silfra Fissure has recognised as world's top diving destination with the clearest water.