Correction for the size of The Citadelle
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How big is 650,000,000 square centimeters?
It's about two-fifths as big as The Citadelle
The size of The Citadelle is about 1,500,000,000 square centimeters.
(a.k.a. La Citadelle, a.k.a. Québec Citadelle, a.k.a. The Citadel) (Québec City, Quebec, Canada) (for the fortified enclosure)
The Citadelle of Quebec, containing Canada's oldest military buildings measures about 150,000,000 square centimeters in total area. The fortress sits on a 90-meter cliffside, overlooking the St. Lawrence River.