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dam sluice gate hartbeespoort dam wall nature water cascade reservoir water release overflow cliff hartbeespoort dam south africa

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hydroelectric dam dam structure trees nature hydroelectric dam hydroelectric dam hydroelectric dam hydroelectric dam hydroelectric dam

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folsom prison johnny cash penitentiary prisoners california life sentence walls blue prison folsom prison folsom prison folsom prison folsom prison folsom prison johnny cash johnny cash johnny cash johnny cash

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dam edersee dam wall reservoir lake eder dam water building hike nature hydropower energy generation barrier wall wall

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dam water reservoir cement dam nature pouring

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