An infinity edge pool (also named negative edge, zero edge, disappearing edge or vanishing edge pool) is a swimming or reflecting pool which produces a visual effect of water extending to the horizon, vanishing, or extending to “infinity”. The term also is used to describe (however, incorrectly) perimeter overflow pools (pools that may be on level parcels, wherein the water flows over one or more edges, usually flush with the decking elevation). One type of location in which the effect is particularly impressive is where the infinity edge appears to merge with a larger body of water such as the ocean, with the sky (if the pool is located on the side of a hill or field of green).