Forrest is a former small railway settlement and stopping place on the Nullarbor Plain, 85 kilometres west of the Western Australia / South Australia state border, established in 1916 during construction of the Trans-Australian Railway. It is on the part of the railway that is the longest – at 478.193 kilometres – stretch of straight railway line in the world. In the 2021 census, the settlement and surrounding area had "no people or a very low population".