Cottage country is a common name in Eastern Canada for areas that are popular locations for recreational properties such as cottages and summer homes. Locally understood to be referring to Muskoka, the Kawarthas, or the Haliburton area. On the other hand, a speaker from Ottawa would use the same phrase to denote the Rideau Lakes area.
Central Ontario includes:
Parry Sound-Muskoka-Haliburton region
Bancroft & Northern Hastings County