Barranquilla is an industrial port city and municipality located in northern Colombia, near the Caribbean Sea. The capital of the Atlántico Department, it is the largest industrial city and port in the Colombian Caribbean region with a population of 1,148,506 as of 2005, which makes it Colombia's fourth most populous city after Bogotá, Medellín and Cali.Barranquilla lies strategically next to the delta of the Magdalena River, 7.5 m from its mouth at the Caribbean Sea, serving as port for river and maritime transportation within Colombia. It is also the main industrial, shopping, educational and cultural centre of the Caribbean Region of Colombia. The city is the core of the Metropolitan Area of Barranquilla, which is constituted by the municipalities of Soledad, Galapa, Malambo, and Puerto Colombia.Barranquilla was legally established as a town on April 7, 1813, although it dated from at least 1629. It grew into an important port, serving as a haven for immigrants from Europe, especially during and right after World War I and World War II, with waves of additional immigrants from the Middle East and Asia. Barranquilla became Colombia's principal port, and with its level of industrialization and modernity earned the city the nickname Colombia's Golden Gate (Spanish: La Puerta de Oro de Colombia). In the 1940s, Barranquilla was the second largest city in Colombia and one of the most modern cities in the Caribbean and in South America, while later, local administrations, given to widespread corruption, brought about a decline in the standard of living. As government investment increased in other Colombian cities, Barranquilla's national position was surpassed.The city is home to one of the most important folk and cultural festivals of Colombia, the Carnival of Barranquilla, which was declared a National Cultural Heritage by the Congress of Colombia in 2001 and recognized by UNESCO in 2003.Ernesto Cortissoz International Airport, was built in Barranquilla in 1919, becoming the first airport in South America. The city is served by domestic and international flights.