Upper Potamus, or Potamus Kathyperthen or Potamos Kathyperthen (Ancient Greek: Ποταμός καθύπερθεν), was a deme of ancient Attica. It lay on the east coast north of Thoricus, and was once a populous place: it was celebrated as containing the sepulchre of Ion.
Upper Potamus is tentatively located at Kaisariani monastery.
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Attica". Dictionary of Greek and Roman Geography. London: John Murray.
37°57′42″N 23°47′52″E / 37.9618°N 23.7979°E