Liberal Arts City

Liberal Arts City or Arts and Sciences City (学芸都市) is a huge artificial island that exists on the coast of California, United States. Originally made as a set for a Hollywood movie, it was later converted into a seaside themed amusement park.

Background
20 years before the events of Touma and Index, an American Hollywood filmaker designed and made a huge artificial island as a setting for a movie. At the end of the movie's filming, comments were made regarding the waste of dismantling such a huge effort made by the crew. Due to this, rather than being destroyed the island was reborn as a seaside resort and theme park.

Toaru Kagaku no Railgun SS: Liberal Arts City
Although not shown in the original Toaru Majutsu no Index series, the Liberal Arts City is the main setting of a the side story Toaru Kagaku no Railgun SS: Liberal Arts City, which takes place soon after the events of the Three Stories Arc.