We snorkeled with dive.is (a Padi center) @ Silfra, a tectonic drift of the Eurasian and North American plates, (the mid-Atlantic ridge) in the Þingvellir National Park, Iceland. Many said Silfra has the clearest water in the world.
… on Google Maps
We totally enjoyed it but suiting up and orientation take long time, far more than snorkeling itself, unfortunately.
瑜伽