Tanandra Bay is a body of water on Ajilon Prime.
In 2267, T'Prynn and Tim Pennington visited Ajilon Prime. Pennington was impressed with the beauty of Tanandra Bay and thought that the Federation Council would likely fast-track Ajilon Prime's admission into the Federation. (VAN novel: Precipice)
In 2373, during the Battle of Ajilon Prime, Starfleet planned to evacuate the staff and patients of the Decker Memorial Hospital via hopper to the Starfleet base at Tanandra Bay. (DS9 episode: "Nor the Battle to the Strong")