GTA 6 takes place in Leonida — a fictional state directly inspired by Florida, anchored by a long-awaited return to Vice City, Rockstar's Miami analogue last visited in 2002.
Leonida adds new districts, marshland, and rural environments around Vice City. Confirmed locations from Rockstar's Newswire posts and trailer footage include:
The full GTA 6 map size has not been officially confirmed by Rockstar. Press impressions from previewers shown private demos have suggested a map roughly 1.5–2× the size of GTA V's San Andreas — but Rockstar itself hasn't put a number on it.