The wikipedia page is close to my conception of Central Ontario, basically dividing Eastern Ontario from the GTA and Southwestern Ontario. The Ministry of Finance
actually classifies something approximating the Greater Golden Horseshoe as Central Ontario. I actually find the districts they use make quite a bit of sense. Aside from the ones labeled Central Ontario, all the counties or districts undoubtably fall within their respective divisions of Ontario. This leaves the ones labelled Central Ontario. Wellington doesn't have a lot in common with Muskoka, but they are both very much connected to the GTA. The only area that I have a hard time seeing fitting with this is the Niagara area, even though it is commonly included in the Greater Golden Horseshoe.
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