An access mat is used to support equipment used in construction and other resource-based activities such as drilling rigs, camps, tanks, and helipads. It may also be used as a structural roadway to provide passage over unstable ground, pipelines and more. They are often used to access work sites in remote or environmentally sensitive areas, such as bogs, wetlands or fens. For that reason, they are often referred to as swamp, bog or wetland mats.