First viewing area for El Rio Del Mundo tank.
Massive tank housing large freshwater fish from around the world. This tank is relatively narrow but stretches across the width of the entire aquarium. As a result, there are at least four separate main viewing areas for this single tank. The aquarium map shows it a bit better:
http://www.acuariodezaragoza.com/images/plano_acuario.jpg
Photo taken on the 10th April 2012.