The Elder Scrolls IV: Oblivion Remastered
The Elder Scrolls IV: Oblivion Remastered Wiki - Maps
Cyrodiil
The game's primary setting -- the central province of Tamriel during the Third Era, home to the Imperial City and the base game's main quest and factions.
The Shivering Isles
The realm of Sheogorath, Daedric Prince of Madness, explored through the Shivering Isles expansion's questline confronting the coming Greymarch.