Tyvia is the northernmost island in the Isles. Its terrain is harsh and its climate is persistently cold. The cities of Tyvia include: Alexin, Caltan, Dabovka, Meya, Samara, Tamarak, and Yaro.
- Tyvia seems to be based on the countries of Scandinavia and Russia.
- Tyvia also produces a fine red wine, which can be found occasionally on various missions.
- Tyvian poison was used to poison Corvo.
- One of Sokolov's paintings is of an anchored whaling ship with the title "Tyvia".