Ilissos (river)2023-08-03T22:45:46ZJ.S. Trailltag:atlantides.org,2023:pleiades/d91f6b73d4725a15c61753df3999372aIlissos (river)tag:atlantides.org,2023:pleiades/d91f6b73d4725a15c61753df3999372a2023-08-03T22:45:46ZIlissos fl. is a river of Athens, Greece, that was originally a tributary of the Kifissos River. The Ilissos is now, for the most part, channeled below ground.