 Industrial areas were traditionally located on the Corio Bay for port access, or the Barwon River for waste disposal.In the interwar and post-World War II years, heavy industry continued to establish itself in the flatter northern suburbs, where today industries such as the Shell oil refinery and Ford Motor Company engine plant reside.Residential development also spread to Corio and Norlane in the north, with new Housing Commission of Victoria estates built to cater for employees of the new industries.