The Sea of Data (データの海) refers to the massive collection of unused data in The World and all derivative games. "Deleted" or discarded data is all broken up and returned, inactive, to the sea. Aside from this, little is understood about it.
After their defeat at the hands of Kite and the .hackers, all of the Phases except for Macha fell into the Sea of Data. As part of the R.A. Plan, Jyotaro Amagi and Jun Bansyoya searched through the Sea and recovered the Phases' data.
- All phases were sent to the Sea of Data after being defeated, and only Macha / Mia could return.
- In G.U., Ovan is sent to this place because AIDA had corrupted largely the data of his character and epitaph, prevented him from returning to normal like the other Epitaph users.
- Aura remains in this place during the events of G.U.