Lower Potamus, Potamus Hypenerthen or Potamos Hypenerthen (), 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., 7.1.2.Suda, s.v. Ποταμός; Harpocr., s.v. Ποταμός
Lower Potamus is tentatively located at Panepistemioupolis.
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