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The Bosherston lily ponds are man-made, created by the Campbells of Cawdor, owners of the Stackpole Estate, between 1760 and 1840. Originally there was a series of wooded valleys containing spring-fed streams, fringed by swamp and wet woodland, that flowed into a tidal creek bordered by saltmarsh and dunes. This system was dammed primarily to form a landscape feature that has become known for its lily beds as well as a wide variety of wildlife. It is now part of the Stackpole National Nature Reserve and is managed by the National Trust.