Βούπορθμος

From LSJ

αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point

Source

Spanish (DGE)

-ου, ὁ Buportmo promontorio de Argólide frente a la isla Aperopia, Paus.2.34.8.