Georgian Bay and the northern part of Lake Huron with the whole northern margin of Lake Superior bathe the foot of the Laurentian plateau, which rises directly from these lakes; so that the older fertile lands of the country with their numerous cities and largely-developed manufactures are cut off by an elevated, rocky and mostly forest-covered tract of the Archean from the newer and far more extensive farm lands of the west.
From Lake Huron to the south-east shore of Saginaw Bay a wide sandy beach is followed northward by precipitous shores abounding in rocks and bluffs.
The north-east shores of Lake Huron and its large expansion Georgian Bay are fringed with thousands of islands, mostly small, but one of them, Manitoulin Island, is 80 m.
Gypsum is obtained from deposits along the banks of the Grand river in Kent county and in the vicinity of Alabaster along the shore of Lake Huron in Iosco county.
Lake Michigan is connected at its north-east extremity with lake Huron by the strait of Mackinac, 48 m.
The most valuable fish taken was walleyed pike, and the catch of this fish and of pickerel from Lake Champlain in 1902 exceeded in value that from any other body of fresh water in the United States excepting Lake Huron and Lake Erie.
So great, however, is the desire to shorten the time and distance necessary for the transportation of grain from Lake Superior to Montreal that an increasing quantity is taken by water as far as the Lake Huron and Georgian Bay ports, and thence by rail to Montreal.
French river, the outlet of Lake Nipissing, and Severn river, draining Lake Simcoe, come into Georgian Bay from the east, and canals have been projected to connect Lake Huron with the St Lawrence by each of these routes, the northern one to make use of the Ottawa and the southern one of Trent river.
Lakes Superior and Huron both reach depths hundreds of feet below sea-level, but the next lake in the series, St Clair, towards which Lake Huron drains southward through St Clair river, is very shallow and marshy.