Sanitary landfill refers to a designated area where solid waste is dumped and buried to prevent environmental hazards. However, there are synonyms used to refer to this type of landfill, which include engineered landfill, secure landfill, and engineered containment landfill. The adjective "engineered" implies that the landfill is specifically designed and constructed to minimize environmental impact. The term "secure" reflects the fact that the landfill is isolated from the surroundings to contain potential leaks and prevent soil, water, and air contamination. The phrase "engineered containment" is descriptive of the infrastructure of the landfill, which includes several layers of synthetic membranes, liners, and drainage systems to hold and manage the waste.