A hole in the middle of a lake in Portugal flown over by a drone. Very beautiful images!

Even if it is not a natural phenomenon, this decor remains extraordinary and of great ingenuity.

SFlight of Lake Covao dos Conchos by Daniel Laves' drone in Portugal. This hole is in a water reservoir caused by a natural dam. By this means, the surplus water, brought by a river, is collected and led through a tunnel 1519 meters lower into another lake called Lagoa Comprida.

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