A mat, to be placed beneath an appliance, has a base layer, preferably made of cardboard, a liquid-resistant layer, preferably of plastic, and a layer of batting. The layers are held together by a peripheral rim. The periphery of the mat includes straight and curved portions, such that when two similarly constructed mats are placed in abutment, the curved portions define areas not covered by the mats. Thus, the mats can be placed under an appliance, without disturbing the legs of the appliance, while still covering a majority of the area under the appliance. The mats provide containment for spills of liquid from the appliance, and also define barriers for deflecting food items which might otherwise become lodged beneath the appliance.