The Baikal oilfish combines two sculpin fish species only found in Lake Baikal. The Baikal oilfish combines two sculpin fish species only found in Lake Baikal. This unique fish has a translucent body with no scales and appears dull when dead.
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Situated in south-east Siberia, the 3.15-million-ha Lake Baikal is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve.
The largest species is the Siberian sturgeon, which sometimes measures more than 6 1/2 feet (2 meters) long. The only mammal is the Baikal seal. The first hydrothermal vents, or hot-water springs, ever discovered in a freshwater lake were found at the bottom of Lake Baikal in 1990.
The world's deepest ancient lake, Lake Baikal in Russia, has a diverse endemic fauna, including Baikal seals Pusa sibirica, the apex predator of the lake and the only pinniped species inhabiting exclusively freshwater systems.
Not only is Lake Baikal safe to swim in, but it also boasts some of the purest water in the world. The only drawback is the temperature - even during the warmer months, a dip in the lake is pretty invigorating.
Blue Lake, New ZealandBlue Lake has underwater visibility up to 70 to 80 meters or 230 to 260 feet down, which is insane! Apart from being the world's clearest lake, it's also the clearest body of natural freshwater. The water in Blue Lake is comparable to distilled water based on laboratory measurements.