A Federation starbase where the Enterprise-D stopped in 2367 to collect scientific equipment and where the engine designer Leah Brahms came aboard to inspect the ship.
Starbase 313 is a Starfleet base that appears in the Next Generation episode Galaxy's Child. The Enterprise-D calls there to pick up scientific equipment bound for a Federation outpost in the Guernica system.
While the ship is docked, Doctor Leah Brahms of the Theoretical Propulsion Group transports aboard to examine the changes Geordi La Forge has made to her engine designs. La Forge, who knows only a holodeck version of her, finds the real woman far cooler and more critical than he expected.
After leaving the starbase the Enterprise encounters a spaceborne creature and its newborn offspring, the problem that eventually brings Brahms and La Forge to work together.