Editing Great Lakes (section)

===Shipping===
Except when the water is frozen during winter, more than 100 lake freighters operate continuously on the Great Lakes,<ref name="clui">{{Cite web |url = http://www.clui.org/section/united-divide-a-linear-portrait-usacanada-border-3 |title = Chapter 4: The Watery Boundary |website = United Divide: A Linear Portrait of the USA/Canada Border |publisher = The Center for Land Use Interpretation |date = Winter 2015 }}</ref> which remain a major [[water transport]] corridor for bulk goods. The [[Great Lakes Waterway]] connects all the lakes; the shorter [[Saint Lawrence Seaway]] connects the lakes to the Atlantic Ocean. Some lake freighters are too large to use the Seaway and operate only on the Waterway and lakes. In 2002, 162&nbsp;million net [[ton]]s of dry bulk cargo were moved on the Lakes. This was, in order of volume: iron ore, grain and [[potash]].<ref>{{cite web |url = http://www.greatlakesports.org/industry-overview/cargoes/ |title = Great Lake Seaway Cargoes – American Great Lakes Ports Association |website = www.greatlakesports.org |access-date = May 18, 2017 |archive-date = May 9, 2021 |archive-url = https://web.archive.org/web/20210509142250/https://www.greatlakesports.org/industry-overview/cargoes/ |url-status = dead }}</ref> The iron ore and much of the stone and coal are used in the steel industry. There is also some shipping of liquid and containerized cargo. Major ports on the Great Lakes include [[Twin Ports|Duluth-Superior]], Chicago, Detroit, Cleveland, Twin Harbors, [[Hamilton-Oshawa Port Authority|Hamilton]] and [[Thunder Bay Port Authority|Thunder Bay]].