Katarraktis (Greek: Καταρράκτης, meaning "waterfall") (before 1928: Lopesi, in Greek: Λόπεσι[2]) is a mountain village in the municipal unit of Farres in the municipality of Erymanthos in Achaea, Greece.

It is 5 km east of Chalandritsa and 20 km southeast of Patras.

The village is situated near a 110 meters high waterfall, hence the name of the village.

Relics from the Mycenean period can be found in the vicinity.