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Lower Pergase or Pergase Hypenerthen (Ancient Greek: Περγασή ὑπένερθεν) was a deme in ancient Attica of the phyle of Erechtheis.[1]
Its site is located near modern Chelidonou.[2][3]
38°05′41″N 23°47′37″E / 38.094782°N 23.79369°E