Guess the French region with the help of this clue: A royal pile

In which of France's 13 regions was this photo taken?

King Henry IV of France was born here

This castle was was the birthplace of King Henry IV of France and was once used as a holiday home by Napoleon.

It was was built in the Middle Ages and has become a symbol of the city where it is located. Legend has it that three stakes (also known as piles) were planted to mark the boundaries of the domain. The French word for a pile is: pieu.

Can you guess where it is located?

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A) Château de Pau (Pyrénées-Atlantiques) in the region of Nouvelle-Aquitaine
An alternative view of the castle