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The area of Pas-de-Calais was the ideal location for the landing. Only 21 miles away from the coast of England.
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The French Cities of Calais and Cherbourg located in relationship to the Coast of England 21 miles away.
Calais and Cherbourg
These Cities are bone of contention between England and French, the reason for which was political and economical. During Nepolean era this location was used as base for the military.
Since, it is a coastal area, it is also important for trade and economy, hence it also known as "Keys to the Kingdom". Because of its narrow distance of 21 miles between France and England, it is a bone of contention.
Learn more about Cherbourg here:
https://brainly.com/question/16960777