From Egypt to Iceland, incredible photographs reveal the beauty of the world's aquatic wonderlands (4)

A diver explores the cathedral at Silfra canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates) at Thingvellir National Park, Iceland. In this photo the American plate is on the left and the Eurasian plate on the right

A pygmy seahorse (Hippocampus bargibanti, 1cm long) shelters in a seafan in North Sulawesi, Indonesia