Starbase 220

From Memory Alpha, the free Star Trek reference

Starbase 220 is a Federation starbase administered by Starfleet.

The USS Enterprise-D was supposed to bring the USS Brattain to Starbase 220, when this ship was stranded in a Tyken's Rift. After the Enterprise had freed itself from the rift, the ship set a course for this Starbase. (TNG: "Night Terrors")

According to the non-canon video game, Star Trek: The Next Generation - Future's Past, this base is located at planet Codis Zeta V-A. A later version of that game titled Star Trek: The Next Generation - Echoes from the Past located this base at planet Pintor Alpha VIII.