One of the most important observatories of the Delta is the Swarovski viewpoint, located on the lagoon and rice fields of Riet Vell. It is the only lookout with closed access. In addition, the main advantage is the proximity of the birds to the viewpoint, so you can take fantastic pictures without having to bring cameras with long-range lenses. 

The entrance to the Swarovski viewpoint is free. However, you can only get there on foot, with a little walk.