Try playing TES2: Daggerfall
it's so huge that the overworld is randomly generated, there's something like... wait lemme look this up:
Bethesda claims that the scale of the game is equal to twice the size of Great Britain:[1] around 487,000 square kilometers. The game world features over 15,000 towns, cities, villages, and dungeons for the player's character to explore. According to Todd Howard, an Elder Scrolls programmer, the game's sequel, The Elder Scrolls III: Morrowind, is 0.01% the size of Daggerfall, but it should be noted most of Daggerfall's terrain was randomly generated. Vvardenfell, the explorable part of Morrowind in the third game has 10 square miles (25.9 square kilometers).[2][3] The Elder Scrolls IV: Oblivion has approximately 16 square miles (41.4 square kilometers) to explore.[4] In Daggerfall, there are 750,000+ non-player characters (NPCs) for the player to interact with, compared to the count of around 1,000 NPCs found in Morrowind and Oblivion. However, the geography and the characters in these later games are much more detailed.