From Star Trek Online Wiki
The Klingon First City on Qo'noS
Qo'noS is the Klingon homeworld, located in the Qo'noS System of the Qo'noS Sector, Omega Leonis Sector Block. It is surrounded by the Praxis Belt, the shattered remains of the moon that exploded in 2293.
 Visitable locations
- First City, capital city and central hub for Klingon players
- Klingon Academy, providing lore missions and new duty officers
- Ketha Lowlands, agricultural area and seat of the House of Martok. Only visited during “Bringing Down the House”.
- Klingon Defense Force Headquarters. Only visited during “Blood of the Empire”.