New Orleans is a major U.S. port and the largest city in Louisiana. New Orleans is the center of the New Orleans Metropolitan Area, the largest metro area in the state. New Orleans is located in southeastern Louisiana, straddling the Mississippi River. It is coextensive with Orleans Parish, meaning that the boundaries of the city and the parish are the same. It is bounded by the parishes of St. Tammany (north), St. Bernard (east), Plaquemines (south) and Jefferson (south and west). Lake Pontchartrain, part of which is included in the city limits, lies to the north and Lake Borgne lies to the east. The city is named after Philippe II, Duc d'Orléans, Regent of France, and is well known for its multicultural and multilingual heritage cuisine, architecture, music (particularly as the birthplace of jazz), and its annual Mardi Gras and other celebrations and festivals. The city is often referred to as the "most unique" city in America.