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Koios (river)

a Pleiades place resource

Creators: G. Reger, J. McK. Camp II
Contributors: R. Talbert, Sean Gillies, R. Scott Smith, Rosemary Selth, Jeffrey Becker, Greta Hawes, Tom Elliott
Copyright © The Contributors. Sharing and remixing permitted under terms of the Creative Commons Attribution 3.0 License (cc-by).
Last modified Sep 05, 2025 09:16 PM — History
An ancient river mentioned only by Pausanias, who describes it, along with the Elektra, as lying between Andania and Kyparissia in Messenia. RE declines to identify it with a specific modern river other than to assert that it must have been a tributary of the ancient Balyra. BAtlas 58 labels a river stretch corresponding to the upper course of the modern Mavrozoumena river as mapped and named in OpenStreetMap. In BAtlDir, the corresponding modern name / location is given as "Malthis ", a name that does not appear in GeoNames, OpenStreetMap, or Wikidata, but that is clearly related to Malthi, a modern village near this river stretch. The BAtlas arrangement makes the Koios a tributary of the Elektra, which is then a tributary of the Balyra.

https://pleiades.stoa.org/places/570365

37.230474235, 21.8703043313
    • Koios (unspecified date range)
    None

river, drainage

Barrington Atlas: BAtlas 58 B3 Koios fl.

The Barrington Atlas Directory notes: Malthis


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G. Reger, J. McK. Camp II, R. Talbert, Sean Gillies, R. Scott Smith, Rosemary Selth, Jeffrey Becker, Greta Hawes, and Tom Elliott, 'Koios (river): a Pleiades place resource', Pleiades: A Gazetteer of Past Places, 2025 <https://pleiades.stoa.org/places/570365> [accessed: 11 February 2026] 

            {{cite web |url=https://pleiades.stoa.org/places/570365 |title=Places: 570365 (Koios (river)) |author=Reger, G., J. McK. Camp II |accessdate=February 11, 2026 1:11 am |publisher=Pleiades}}