Huanglong Cave water mill in Hunan, China.
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Previously:
https://www.homemadetools.net/forum/...663#post159339
https://www.homemadetools.net/forum/...938#post144717
https://www.homemadetools.net/forum/...340#post142325
https://www.homemadetools.net/forum/...727#post163373
https://www.homemadetools.net/forum/...1660#post94342
