From Warhammer 40k - Lexicanum
- 29 planets, 18 of which are inhabited, most notably Boros Prime
- 24 colonized moons and asteroids
- The Trajan Belt, an asteroid belt 1,000 km thick
- Kronos, the largest space station in Segmentum Obscurus
- 400,000,000,000 inhabitants, Imperial citizens all
- A plethora of wormholes into the warp known as the Boros Gate.