Rjukan–Notodden Industrial Heritage Site

The Rjukan–Notodden Industrial Heritage Site is a World Heritage Site in Telemark county, Norway, created to protect the industrial landscape around Lake Heddalsvatnet and Vestfjorddalen valley. The landscape is centered on the plant built by the Norsk Hydro company to produce calcium nitrate fertilizer from atmospheric nitrogen using the Birkeland–Eyde process.

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