The South Creek or Wianamatta is a creek that is part of the Hawkesbury-Nepean catchment, located on the Cumberland Plain in Greater Western Sydney, New South Wales, Australia. The creek rises in Sydney's south western suburbs below the former Oran Park Raceway about 4 kilometres north-east of Narellan and 7 kilometres west of Minto. In its upper cat…The South Creek or Wianamatta is a creek that is part of the Hawkesbury-Nepean catchment, located on the Cumberland Plain in Greater Western Sydney, New South Wales, Australia. The creek rises in Sydney's south western suburbs below the former Oran Park Raceway about 4 kilometres north-east of Narellan and 7 kilometres west of Minto. In its upper catchment, the creek forms the boundary between the suburbs of Oran Park and Catherine Field. The creek flows generally north, joined by seventeen tributaries including Badgerys Creek, Kemps Creek, Ropes Creek and Eastern Creek, until reaching its confluence with the Hawkesbury River, near Windsor. The creek descends 94 metres over its 70 kilometres course.