bottomless karst lake |
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| navigate by keyword : amazing border cave cavern chalk clear climate color conservation deep ecology entrance exotic explorer formation geology hole idyllic image inside location map miracle part people photography point popular reef reflection rock scenery scenic scientist shade shadow shallow shape source spooky stream system tourist tranquil translucent transparent turquoise underground wave well wild |
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| The large karst lake of the Mazuevskaya karst depression Western Urals, Russia at the bottom has outlets to the lower water horizon and therefore seems bottomless |
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