Depends on how you define location. By the place name? If so:
- The location would be Nürburg, Germany
- Nürburgring would the name of the motorsport complex
- The motorsport complex would consist of 3 tracks (Nordschleife etc.)
Still, we can argue the actual definitions all day long because it really doesn't matter whether a location refers to a country or a place name. In reality, what we are referring to in game design and rendering terms are "environments" that share the same game assets. For example (forgetting any reverse variants):
- Trial Mountain is 1 environment with 1 track
- Nürburgring and the GP circuit is 1 environment with 2 tracks
- Suzuka, Suzuka East and Suzuka West is 1 environment with 3 tracks
- Twin Ring Motegi Road, East, West and Speedway is 1 environemnt with 4 tracks
Straight away, we have 4 environments with 10 tracks between them. Add reverse versions into the mix and you effectively have 4 environments with 20 tracks between them.
To me, it is blatantly obvious that the number 20 being thrown around does not simply relate to the number of tracks in the game.