Geography
Sarnia is located where Lake Huron empties into the St. Clair River. Most of the surrounding area is quite flat, and clay comprises most of the soil. Despite this, the soil is remarkably rich for growing and planting since the entire area was submerged prior to the Ice Age and plant and animal matter formed many layers of sediment as they settled after the waters receded. During the Ice Age, glaciers covered most of the area as evidenced by the existence of the Great Lakes. The terminal moraines dumped even more nutrients into the already very rich soil. Sarnia is not part of the Canadian Shield, being just beyond its southernmost reaches. The Canadian Shield itself has been largely untouched by water since long before the seas covered Sarnia. Sarnia is located 280 km West of Toronto and 90 km North of Detroit.
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