In the rio del mundo exhibit, a 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/ima...no_acuario.jpg
Photo taken on the 10th April 2012.