Blue Lake

As recently as the 1980s this was a working Tin mine. As the mining process was intensive in its use of water with powerful jets of water seperating the tiny grains of tin oxide from the rest of the gravel. When the mine closed the water races remained and flooded the pit.
While the water looks beautiful, it is acidic and high in aluminium that leached from the decomposing granite and causes its amazing colour. And certainly not suitable for drinking or swimming. Not to mention that the deep sides would make it dangerous to get out.

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