Since the Middle Ages, a crescent moon has appeared on the city's coat of arms. The “Port of the Moon” has been listed as a UNESCO world heritage site since 2007.

With the exception of Paris, Bordeaux is the French city with the most protected buildings, according to the website of the UNESCO World Heritage Convention. A crescent-shaped curve is found in the shape of the river bed, which flows into the harbor of Bordeux. The city has been known as “Burdigala” since the Romans, fueled by its wine trade.