Nagnata (Greek: Νάγνατα) or Magnata (Greek: Μάγνατα) is a town noted on the co-ordinate map of the 2nd century AD Alexandrian scholar Claudius Ptolemy in the territory of the Nagnatae (Ναγνᾶται). It is located in northwest Hibernia between the mouths of the rivers Ravius (Ῥαουίος), perhaps the Erne, and Libnius (Λιβνίος), perhaps the Moy. This is the only town noted on the Irish west, southern or northern coast. Surviving manuscripts of Ptolemy's Geography refers to the towns Hibernis (Teamhair'Erann/Tara), Rhaeba (Cruchain/Rathcroghan) and Magnata (Sligo) as "ἐπίσημος", an Ancient Greek word meaning "eminent" or "distinguished". Much of his work was based on the now lost geography of Marinus of Tyre.