The Kororoit Creek is a watercourse of the Port Phillip catchment, rising in the outer north western suburbs of Melbourne, in the Australian state of Victoria. The Kororoit Creek rises below Mount Kororoit, northeast of Melton in the north western outer suburbs of Melbourne. The creek's headwaters are north of Sunbury at approximately 400 metres abov…The Kororoit Creek is a watercourse of the Port Phillip catchment, rising in the outer north western suburbs of Melbourne, in the Australian state of Victoria. The Kororoit Creek rises below Mount Kororoit, northeast of Melton in the north western outer suburbs of Melbourne. The creek's headwaters are north of Sunbury at approximately 400 metres above sea level in ordovician geology. The creek flows generally south by east and passes over the volcanic lava plain of western Melbourne to its mouth at sea level, north of Altona and emptying into Altona Bay within Port Phillip. The creek is joined by one minor tributary as it descends approximately 407 metres over its 52-kilometre course. 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.