Terrain Types
You can only cross water and mountains by the use of the appropriate vessel, or a chocobo with the proper abilities. You can only land or disembark from chocobos and vehicles on certain types of terrain and never on mountainsides.
Type
Frequency of Encounters
Disembark Vehicle?
Grassy Normal Boat, Chocobo, or Airship
Swamp High Chocobo or Airship
Beach Normal Boat or Chocobo
Forest High Chocobo
Desert High Chocobo or Airship