Far Cry 6 (FC6) has a huge World Map. This page reveals the full in-game map in high resolution.
There are 6 Regions: Isla Santuario, Libertad HQ, Madrugada, Valle De Oro, El Este, Esperanza.
The total map size of Far Cry 6 is 88km² (9400m height x 9400m width). About a third of this is water (29km²) and two thirds are land mass (58km²). Flying from one side of the map to the other using a helicopter takes 7 minutes. Running from one end of the landmass to the other on foot (east-west is about 7800m) takes around 20 minutes.
Below you can find the full Far Cry 6 World Map (In-Game Map).
Compared to previous Far Cry games this is the biggest map of all of them so far.