Wittenoom is a declared contaminated site and former townsite 1,420 kilometres (880 mi) north-north-east of Perth, in the Hamersley Range in the Pilbara region of Western Australia. The declared contaminated site comprises 50,000 hectares (120,000 acres), making it the "largest contaminated site in the southern hemisphere". As of September 2022, Wittenoom has no residents, and is planned to be demolished by the Western Australian Government.