overworld

Short definition from Wiktionary

Noun

1. 1
   The celestial world.
2. 2
   The community of law-abiding citizens.
3. 3
   An overarching map or region connecting various disparate towns, dungeons, or stages, usually represented on it by icons.
4. 4
   The portion of a game that is set above ground, as opposed to underground caves etc.
5. 5
   The entirety of the world where the player can walk around, as opposed to separate game sections for battles, puzzles, etc.