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https://www.thespruce.com/what-is-a-freeform-pool-2736847

What is a Freeform Pool?    Alternate Spellings: Free-form pool; free form pool.
A swimming pool that is designed in a naturalistic or irregular style and shape, with curves or flowing lines. Contemporary freeform pools often have rock and waterfall features and are designed to resemble a natural pond, lake or oasis.


https://homedesignlover.com/pools/free-form-pool-designs/