Umbral sector

The Umbral sector was a sector in the galaxy's Gamma Quadrant, and located in or near Dominion space. In 2411, it became one of twenty sectors that the Dominion granted the Alpha Quadrant Alliance access to, in order to jointly fend off the Hur'q Invasion. 

Naming
The sector's name was derived from the Umbral system, which was located within its borders. 

Location
In the block of twenty sectors accessible to the Alliance, the Umbral sector marked the most coreward corner, and thereby shared a border with only two sectors. The New Yadera sector sat to Umbral's "north", and the Didarea sector to its "west", with the Telos sector positioned diagonally across Umbral and between New Yadera and Didarea. 

The Umbral sector was situated circa 70.000 light-years from Sol. 

History
In 2411, the Hur'q returned from their hibernation and began a campaign of ravaging the Dominion and its subject worlds. In desperation, Ambassador Odo turned to the Alpha Quadrant Alliance, granting them access to twenty sectors of the Gamma Quadrant in a bid to fight back the Hur'q Invasion together. 

The Hur'q targeted this sector for invasion and faced joint opposition by the Dominion and AQA. 

Following a secret mission by the Ferengi Alliance to T'Ket's Iconian fleet in the Pheben sector, a stable Iconian gateway opened in the Umbral system, and connected it to the gateways in the Jouret system and Jenolan Dyson Sphere. 

Nations

 * Dominion
 * Hur'q

Star systems and planets

 * M'brii system
 * Umbral system
 * also an Iconian gateway

Connections
Umbral-Sektor