Answer
Can you build a natural swimming pond on clay soil?
Yes, and clay ground often helps, as long as the build is designed for it.
In short
Yes. Clay ground holds water, which can actually help a pond, and the build is designed to suit it. The clay vale around Chippenham is a good example of ground that lends itself to a natural or wildlife pond, as long as the excavation, lining and regeneration zone are designed for the conditions.
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