Final answer:
Calgary is Canada's 3rd largest city, located in Alberta, and hosted the 1988 Winter Olympics, with events at the Saddledome Arena.
Step-by-step explanation:
The country with Calgary as its 3rd largest city is Canada. Calgary is situated on the confluence of the Bow River and the Elbow River in the province of Alberta.
The city is notable for being the host of the 1988 Winter Olympics, which included events at the iconic Saddledome Arena. It's also worth mentioning that the national capital of Canada is Ottawa, while the provincial capital of Alberta is Edmonton, not Regina as that is the capital of the neighboring province, Saskatchewan.