The mysterious setting where the survivors land in Lost is referred to simply as the Island.
The Island is the central location of the series and is presented as an unusual, difficult-to-locate place in the South Pacific. It contains ancient ruins, underground facilities, unusual natural phenomena, and a healing effect that influences several characters’ storylines.
Rather than receiving a conventional proper name in the series, the location is generally called “the Island.” Its identity and purpose become major parts of the mythology. Characters learn that the Island has a protector and that its light is connected to forces considered important to the world’s balance.
The Island should not be confused with fictional locations from other series or films. The survivors’ home is not officially called Isla Nublar, and “the Rock” is only an informal descriptive phrase, not the canonical name used by Lost.