Volcanoes
Natural "Lakes" form only naturally - either in mountainous areas or volcanic landscape. Water bodies with contour bunding or cemented borders and wall\s are no more than tanks. Fumaroles, geysers, hydrothermal vents, and hotsprings make an eerie outwordly landscape. It can potentially create a lava lake or also a fresh water lake which will be filled with chemicals like sulphur, ferrous oxides, nitrogen Carbon compounds etc making it a lethal cocktail unfit for human, animal or plant consumption. But over a period of time the surrounding areas become infinitely fertile and rich in bio and zoo diversity. Japan being on the Ring of Fire is home to many volcanoes. Together with volcanic emissions and oceanic westerlies Japan enjoys balmy weather except in the higher latitudes and higher reaches despite Japan being in the temperate zone. Volcanic snow-scape in Kamchatka peninsula, Russia. Kamchatka is on the Ring of Fire. A peep into volcanic crater or caldera rev...