This page contains information regarding I AM ERROR, and thus may contain spoilers.
"There were eighty thousand souls on that base... a large contingent of our leadership and at least... three starships... the Klingons are practically in Earth's backyard..."
Starbase 1 was a Federation starbase administered by Starfleet. It was located 100 AUs from Earth, near a planetary body. In the 2250s the starbase was home to over 80,000 Federation personnel.
During the Federation-Klingon War, the starbase was conquered by the House of D'Ghor. The battle resulted in the deaths of many of the top leaders of Starfleet Command and at least three Starfleet ships destroyed. (DIS: "The War Without, The War Within")
The distance from Earth places the base in the scattered disc of the Sol system, with the starbase likely orbiting an icy dwarf planet.