When someone hears about human intervention in nature, he usually pictures traumatic alterations and concrete monsters. However, there are exceptions to the rule. Inarguably, one of these exceptions is the sluice of The jewel of Karditsa and the artificial lake of Plastira . The construction did not affect negatively the natural environment, but instead helped and enforced its development. The length of the lake is 14km, maximum width 4km, maximum depth 60m.
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