Where is GTA 6 set?

In the fictional state of Leonida, inspired by Florida, with a modern Vice City (inspired by Miami) and five more regions: Leonida Keys, Grassrivers, Port Gellhorn, Ambrosia and Mount Kalaga National Park.

Checked by the GTA 6 Guide against Rockstar, Take-Two, official stores and the press. Sources for each fact are on the credits page.