Iceland - Mývatn and Laxá

"The Mývatn area has unique geological and biological conservation values. Precipitation is trapped by the porous volcanic bedrock and moves beneath the surface until it reappears in a series of springs which supply systems of rivers and lakes. The largest of these is the wetland area of Mývatn and Laxá. Lake Mývatn (37 km²) is situated 278 meters above sea level and contains more than 50 islands. The landscape around the lake and in many of the islands is dominated by perfectly shaped pseudo craters, formed by steam explosions as hot lava flowed into the lake some 2300 years ago. The best known of the craters are Skútustaðagígar, which has a special protection status. The name of the lake, Mývatn, derives from the vast numbers of midges (aquatic insects) that emerge from the lake, forming impressive mating swarms on its shores. Mývatn and Laxá have one of the world's richest populations of breeding aquatic birds. In all 115 species of birds have been recorded in the area, including 28 species of ducks..." Source: UNESCO World Heritage Tentative List

A multi-view of Lake Myvatn, Iceland. Thanks to Marie of France who visited Iceland.