 At the outlet in Altona Bay, the creek winds its way through the Altona Coastal Park and then the Jawbone Marine Sanctuary Park, where it enters Port Phillip.From east of Sunbury, the Kororoit Creek makes its way down through many suburbs towards its mouth, including the towns and suburbs of Rockbank, Caroline Springs, , , , , Cairnlea, , , , and Altona North.The creek is traversed by the Melton Highway, east of Melton; the Western Highway and the Western Ring Road, at Ardeer; and the West Gate Freeway and Federation Trail at Brooklyn.