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I don’t know how big a pond you are trying to make... https://www.amazon.com/dp/B004DL0Y4Y/?tag=backy-20 Or a kiddie pool is cheaper than a “pond” form. Or do a CL search for stock tanks and see what you come up with. You can probably get something quite large at a good price.

Probably not. Most tarps are woven and will eventually leak. They can repel splashing rain but aren’t made to actually contain water.

You could just dig out whatever shape you want and use a liner, you don’t need the pond form.