Ciénaga Grande de Santa Marta
The Ciénaga Grande de Santa Marta (Spanish for Large Marsh of Saint Martha) is the largest of the swampy marshes located in Colombia between the Magdalena River and the Sierra Nevada de Santa Marta. It has an area of 4280 km2 and belongs to the outer delta system of the Madgalena River  and is separated from the Caribbean Sea by a narrow, sandy artificial spit built in the 1950s on which is situated coastal route 90 from Barranquilla to Santa Marta. The marsh's large lagoon is connected to the Caribbean Sea via a narrow strait (the La Barra channel) located between the town of Pueblo Viejo and the city of Ciénaga.
- UNESCO Biosphere Reserve information
- (Spanish) Colombia National Park system website
- At Coastal Wiki