In late 2370, the USS Enterprise-D picked up Wesley Crusher and Fleet Admiral Nechayev on the starbase, before going to Dorvan V. (TNG: "Journey's End" ) According to Star Trek: Star Charts (p. 37) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Starbase 310 was located in the Alpha Quadrant.