Zarush

Zarush was a class M planet, a Klingon colony world in the Cardassian Union. Zarush was one of two class M planets in the system, located inside the Pearl Nebula, in the galaxy's Alpha Quadrant. In the 2370s decade, Zarush belonged to the Klingon Empire. ( mission: "Uprising: A Dagger at Zarush")

History
On stardate 54642.8 (2377), a hitherto secret Cardassian fleet destroyed the Federation main reserve fleet, stationed at Starbase 109 in the Pearl Nebula. With Starfleet otherwise occupied, it fell to the Klingons to defeat the Cardassian uprising. Chancellor Martok himself came to the Zarush system. The, flagship of the Empire, boarded the derelict Starfleet facilities and ships, and led the defense of Zarush against further Cardassian attacks. ( mission: "Uprising: A Dagger at Zarush")