Isla Nublar is the home of Jurassic Park, a island of genetically cloned Dinosaurs as a theme park.
It is owned by John Hammond, but characters like Tonto and Thomas have share in it.
Thomas and Rattrap traveled here before the climax, stopping Nedry from unleashing the dinosaurs, but ended up killing the dangerous raptors. Later Thomas had the greenian kids come here for vacation, with humorous results. Other character have vacationed here as well.