A negative-edge pond is designed so water appears to vanish over one side. You may also hear it called a vanishing-edge or infinity-edge pond. From the main viewing point, the pond's surface seems to meet the landscape without an obvious rim.
Where does the water go?
The water does not disappear. It passes over the selected edge into a separate collection area, then returns through the feature's recirculating system. The collection area and the visible pond are parts of one water feature. How they are arranged depends on the site and the design.
How is it different from an ordinary pond edge?
Most pond edges visibly contain the water. In a negative-edge design, one edge is deliberately used as an overflow to create the disappearing-water effect. The view, surrounding grade, and where the water is collected all influence the appearance. It is a design choice, not a promise that the pond needs less care or has better water quality.
Is it the same as a pondless waterfall?
No. A negative-edge pond still has a visible pond. A pondless waterfall displays flowing water without an open pond at its base; its water is collected and recirculated out of sight. Both involve recirculation, but they create different experiences and need their own site-specific plans. For the other concept, see Pondless Waterfalls - A Beautiful and Low-Maintenance Water Feature.
What should you ask before choosing one?
Decide which view matters most, where water can be collected, and how you will access the feature for routine care. A qualified pond designer can explain how the edge and collection area would work on your property. This overview does not specify a basin size, pump flow, or construction method; those choices require a plan for the actual site.