The copper-green waters of the Libiola mines.
Just behind Sestri Levante, in the Villa Libiola area, you can still see the remains of the ancient (perhaps very ancient, I read that it was even over 3000 years ago) copper mines.
There is a beautiful path that starts right from that location and that for the first few kilometers of the climb passes right through the former mining area.
To continue the walk you cross this stream (which in many parts of the year is just a trickle of water) which is a pastel green-blue color precisely because it is full of copper oxide.

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Photo taken with Canon EOS M100 and lens Tamron 16-300.

Along the path I took several photos, which if you want, are here:

Libiola is a historical hamlet of the Italian municipality of Sestri Levante, in Liguria. Well known for the presence of copper mines where they worked until 1961/62, known since prehistoric times and exploited intensely since the Roman era.
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The verdigris waters of the Libiola mines – Les eaux vert-de-gris des mines de Libiola – Las aguas cardenillo de las minas de Libiola – As águas verdejantes das minas de Libiola – Das Grünspanwasser der Minen von Libiola – Vùng nước xanh tươi của mỏ Libiola – 利比奥拉矿的铜绿水 – リビオラ鉱山のヴェルディグリス海域