The region has a long history of marine transportation, with hundreds of millions of tonnes of cargo moving along the Great Lakes, and Saint Lawrence Seaway each year. The Welland Canal is a vital part of the Great Lakes Waterway allowing ships to avoid Niagara Falls. The St. Clair River and Detroit River are also well travelled rivers between Lake Huron and Lake Erie in the Windsor, Sarnia area. Major, regional ports include the Port of Hamilton and Port of Windsor with smaller ports in Oshawa, Toronto, Goderich and Sarnia. Southern Ontario also has thousands of other fresh water lakes and rivers, as well as the Trent-Severn Waterway and Rideau Canal.