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Buporthmus (Ancient Greek: Βούπορθμος) was the name of a steep promontory in Argolis that extended into the sea near Hermione (Argolis). There was a temple dedicated to Demeter and Persephone, as well as another to Athena Promachorma (meaning "Champion of the Anchorage"). It was probably between the modern Cape Muzaki and Dokos island.