Well I got a little carried away here but here are some standout sights in Ontario, as well as just general pictures of different eco-regions and such. The province generally transitions from north to south with tundra and treeless to the north to the coniferous and boggy Canadian Shield, then to mixedwood forests, then to agricultural and the only deciduous tree region in the country.
Algonquin Park
oth's Rock Trail View by
Eddy Tse, on Flickr
Scarborough Bluffs
Scarborough Bluffs by
Philip Dunn, on Flickr
Mixedwood Plains (eco-region)
1160 by
ontario photo connection, on Flickr
Sandbanks, Lake Ontario
Sandbanks Dunes by
Tom Podolec, on Flickr
Bon Echo
Mazinaw Mushrooms by
Andrew Morse, on Flickr
Hudson Bay Lowlands (eco--region)
Shores of Hudson Bay! by
J. H., on Flickr
Niagara Falls
Horseshoe Falls - Niagara Falls Canada by
Tduane Parker, on Flickr
Lake Huron ice volcano
Waves on The Beach by
Mark, on Flickr
Canadian shield (ecoregion)
Ox Bay - French River by
Debbie Oppermann, on Flickr
Rolling hills and country side
1150 by
ontario photo connection, on Flickr
Carolinian/deciduous forest (eco-region)
Misty Morning ~ Glen Stewart Ravine by
~EvidencE~, on Flickr
Great Lakes
Stormy Sky on Lake Huron by
Roger C, on Flickr
Ouimet Canyon
Ouimet Canyon by
Carlos V., on Flickr
Point Pelee marsh, Lake Erie
Marsh Boardwalk Overlook - Point Pelee National Park (Ontario, Canada) by
Andrea Moscato, on Flickr
Kama Bay, Lake Superior
Kama Bay by
glenn tanaka, on Flickr
Lake Huron Grotto
The Grotto 3 by
Chuck Johnston, on Flickr
Niagara Vineyard
View of the Vineyards by
Orion 2, on Flickr
Autumn Colours . . . by
Clement Tang, on Flickr
Cheltenham badlands
Cheltenham Badlands by
Maurice P., on Flickr
Grand Bend , Lake Huron
beach by
AromaY, on Flickr
Deciduous forest
Glen Major by
Jim Jimmy, on Flickr
La Cloche Mountains
Arrival of Autumn in Killarney, Ontario by
Ruth Choi, on Flickr
Rolling countryside
homestead, late Summer, Flamborough, Ontario. by
edk7, on Flickr
Woodlands
White Trillium Blooms by
Jack Tome, on Flickr
That's probably enough, LOL.