Pausanias gives Aganippe its clearest physical location. A visitor approaching the grove of the Muses on Mount Helicon encountered the spring on the left. He also says that Aganippe was a daughter of the Termessus, the stream that flowed around the mountain. This makes the spring both a geographical feature and a divine female presence in local tradition.

The names Termessus and Permessus require caution. Hesiod names the Permessus among the waters in which the Muses bathe, while Pausanias calls Aganippe's father Termessus. Ancient and later geographical traditions often treat Termessus and Permessus as alternative names or forms for the same Heliconian river. The evidence therefore does not justify describing them confidently as two unrelated neighbouring streams.

Aganippe is not named in Hesiod's opening catalogue of the Muses' bathing places. The Theogony gives Permessus, Hippocrene and Olmeius. This absence matters because later retellings sometimes insert Aganippe into Hesiod's personal initiation scene. The secure connection is broader: Aganippe belongs to the same Heliconian sanctuary landscape but is specifically described by later sources.

Ovid makes the spring part of the contest between the Pierides and the Muses. The mortal sisters demand Hippocrene and Boeotian Aganippe if they win, offering their own northern lands if they lose. The contest ends in their defeat and transformation, so Aganippe remains within the sacred territory of the divine singers.

Virgil preserves the spring as a poetic landmark. In Eclogue 10 he asks where the Naiads were while Gallus suffered for love and names Aonian Aganippe among the places that did not detain them. The word Aonian identifies the spring with Boeotia and shows that Roman readers could recognise Aganippe as part of the established geography of poetic inspiration.

Other Roman poetry blurs Aganippe and Hippocrene more deliberately. Ovid's Fasti can speak of 'Aganippian Hippocrene', allowing the name of one Muse spring to colour the other. That poetic fusion should not erase Pausanias's topography, which places Aganippe on the approach to the grove and Hippocrene about twenty stades above it.

Aganippe later became a conventional fountain of poetic inspiration, but the earliest secure scenes do not describe one universal ritual of poets drinking from it to receive talent. Its identity is stronger when kept close to the evidence: a named Heliconian spring, the Naiad who embodies it, the Muse sanctuary road and a literary tradition that gradually makes its water a symbol of inspired song.