A swimming pool gap securement assembly prevents the accessibility of persons, animals or other objects into swimming pools, because of gaps left between the edges of a swimming pool cover and the surfaces of vertically rising decorative landscape obstructions associated therewith. The assembly provides one or more protective extensions of a swimming pool cover which covers any gaps present when a swimming pool cover encounters these vertically rising obstructions. These panels, one for each gap encountered, are generally of triangular shape, of the same fabric as the main pool cover or any other pool cover materials, and are sewn into, or otherwise attached to, the reinforced webbing at the edge of the pool cover. The lower horizontal edge and the vertical end edge of the wing extension panel have an attached edge strip with a linear array of holes engageable with one or more anchors imbedded into the deck or on the side of the obstruction itself.