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There are an unknown number of hollowed out tree logs still in service and being used to transport drinking water.

https://www.kake.com/news/wichita-used-to-use-trees-as-water...

Every once in a while they dig one up by accident in Boston. Many ~ancient cities don't even know where all the pipes are, or how they're connected. It'll be a colossal project.

Unavailable in EU, so here we go; https://archive.is/9I14n

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