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A drone image shows two women swimming in the Blue Lake of Skra, Kilkis, Saturday, July 31, 2023. Lake Skra is called blue because the shade of its waters is between the tones of blue and green. The lake owes its color to the fossilized microorganisms that exist on its bottom, as well as to the reflections of the verdant environment on its surface.
A drone image shows two women swimming in the Blue Lake of Skra, Kilkis, Saturday, July 31, 2023. Lake Skra is called blue because the shade of its waters is between the tones of blue and green. The lake owes its color to the fossilized microorganisms that exist on its bottom, as well as to the reflections of the verdant environment on its surface.
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