TERMESSOS was a River-God of Boiotia in central Greece.
The Termessos (or Permessos) stream had its headwaters on Mount Helikon in Boiotia. It flowed north past the town of Askra, and emptied into Lake Kopais. The most important neighbouring rivers were the Kephisos to the north-west, Lamos in the south, Ismenos to the south-east, and Pleistos in the west.
Pausanias, Description of Greece 9. 29. 5 (trans. Jones) (Greek travelogue C2nd A.D.) :
"Aganippe was a daughter of the Termessos, which flows around Helikon."
- Pausanias, Description of Greece - Greek Travelogue C2nd A.D.