A crystal clear river is so clean that the 50ft deep riverbed can be seen from a bridge crossing over the water.
The 30km long Verzasca River in Switzerland is renowned all over the world for its clear turquoise waters.
But while pictures of the sparkling waters are often taken from the mountains surrounding the river or from bridges crossing over it, it’s much rarer to see photographs taken from the bottom of it.
Under the bridge: This stunning photo by Claudio Gazzaroli, 38, shows the arched Roman Bridge crossing over the Verzasca River in Switzerland from 50ft under water
Aareschlucht, Switzerland is a section of the river Aar that carves through a limestone ridge near the town of Meiringen. This is an indirect product of glaciation; 10,000 years ago, just as the Ice Age was coming to an end, torrential runoff water from melting glaciers eroded a deep, narrow chasm through the limestone barrier. Although barely one mile long, this passage is bordered by sheer cliffs up to 165 feet (50 m) high on either side. At the bottom of this steep drop the river is only a few metres wide.