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The Parana is the second longest river is South America; its delta is a huge forested marshland about 32 km (20 mi) northeast of Buenos Aires. The area is a very popular tourist destination with guided boat tours that venture into this vast labyrinth of marsh and trees. The Parana River delta is one of the world's greatest bird-watching destinations. This false color satellite image highlights the striking contrast between dense forest and wetland marshes (deep red and violet), and the winding blue ribbon of the Parana River. The large north-south-trending water body on the right is the Uruguay River. Image courtesy of USGS.