Underwater Observatory is an attraction in Jurassic World. It is located in the Jurassic World Lagoon. It is a place where you can get a fish-eye view of the Mosasaurus. It also has prehistoric fish that can be viewed as well.
The Underwater Observatory was a dome that was located on the other side of the Lagoon, near the hotel. It was a glass dome that was in the Lagoon, and where guests could see the Mosasaurus up close. Guests can also see prehistoric fish here. The Underwater Observatory may be where the bleachers go down after the Mosasaurus Feeding Show, but the official park map shows where the Underwater Observatory is, and where the dome for it is located. However, the map location may just be an inconsistency to the film.