Wittenoom is a former town and a declared contaminated site, 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 46,840 hectares, making it the largest contaminated site in the southern hemisphere, an area nearly 1⁄5 the size of the Chernobyl exclusion zone area. The Government of Western Australia "strongly advises against all travel through Wittenoom and the surrounding areas."