Lya III was the third planet in the Lya system. This system was located in Sector 30. A Federation starbase administered by Starfleet was located at this planet. Subspace messages sent from this starbase to ships near the Romulan Neutral Zone had a time lag of two to three hours.
In 2366, Vice Admiral Haden was based at this starbase. During the Nelvana Incident, he was the representative of Starfleet Command and sent messages to Captain Picard aboard the USS Enterprise-D. (TNG: "The Defector")