The Golden Horseshoe reference article from the English Wikipedia on 24-Apr-2004
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Golden Horseshoe

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The Golden Horseshoe is a densely populated geographical region at the west end of Lake Ontario in southern Ontario, Canada. The built-up region extends from the Niagara Falls region at the eastern end of the Niagara Peninsula, west to Hamilton, and then east again across the northern edge of Lake Ontario, past Toronto to, approximately, Oshawa.

The name of the region is derived from its characteristic horseshoe shape, with Hamilton in the centre and Niagara Falls and Oshawa at either end.