1.  The Parana is the 14th-longest river in the world, flowing 2,485 miles across southeastern South America. It begins at the junction of the Paranaiba and the Rio Grande rivers, flows southwest to the Paraguay River, then south and east through Argentina to the Uruguay River and the Rio de la Plata.

2. The Parana river has the second largest drainage system on the continent. Flooding is common on the southern Parana, which also many waterfalls and a large dam built in the 1980s.

3.The Parana River Delta is also considered one of the biggest bird-watching destinations.

We got these facts from :

http://www.socialstudiesforkids.com/articles/geography/paranariver.htm