Located at the junction of the Mobile River and Mobile Bay on the northern Gulf of Mexico, the city is the only seaport in Alabama. The Port of Mobile has always played a key role in the economic health of the city beginning with the city as a key trading center between the French and Native Americans down to its current role as the 10th largest port in the United States. As one of the Gulf Coast's cultural centers, Mobile houses several art museums, a symphony orchestra, a professional opera, a professional ballet company, and a large concentration of historic architecture. Mobile is known for having the oldest organized Carnival celebrations in the United States, dating to the 1700s of its early colonial period. It was also host to the first formally organized Carnival mystic society or "krewe" in the United States, dating to 1830. People from Mobile are known as Mobilians.