μακρότατος

From LSJ

ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers

Source

French (Bailly abrégé)

v. μακρός.

Russian (Dvoretsky)

μακρότατος: superl. к μακρός.