Starbase 211

Starbase 211 was a Federation facility in the Alpha Quadrant in the 24th century, not far from Cardassian space, the Demilitarized Zone and Deep Space 9. It was also the closest base to the Argolis Cluster. 

Ships stationed at Starbase 211 would be called to defend DS9 in the event of an enemy attack. ()

In the 2360s, Mary Barranco served on Starbase 211 as a junior operations officer, early in her career. Privateer Corbin West lived on the station at the same time. (: "Dark Helix", "Distant Whispers")

The USS Enterprise (NCC-1701-D) escorted the USS Phoenix to Starbase 211 in, following Captain Ben Maxwell's attacks on Cardassian ships and facilities in 2367. 

Section 31 had a lab on Starbase 211. In the late 2370s, they housed a mutated strain of Rigelian fever there. In 2383, they conducted experiments with Borg drones and nanoprobes recovered from the Battle of Sector 001. (: "Dark Helix", "Distant Whispers")