b/ Egypt
As John C said, in the story of Moses in Exodus
"But when she could no longer hide him, she got a basket made of papyrus reeds and waterproofed it with tar and pitch. She put the baby in the basket and laid it among the reeds along the bank of the Nile River."
Also Pliny, book lib. , cap. 16, "naves papyraceas armamentaque Nili", "ships made of papyrus and the equipments of the Nile:" and lib. xiii., cap. 11, "ipsa quidem papyro navigia texunt": "Of the papyrus itself they construct sailing vessels." Herodotus and Diodorus have recorded the same fact; and among the poets, Lucan, lib. iv., ver. 136: Conseritur bibula Memphitis cymba papyro, "The Memphian or Egyptian boat is constructed from the soaking papyrus."
c/ N.America where it is known as a bull boat, covered , like a coracle by hide. (From Mandan Nataive Americans ?)
d/ Asia
*Tibet – ku-dru and kowas
* Vietnam – thung-chai
* Iraq – gufa or quffa
*India – parisal (tamil) teppa or harigolu (kannada)
So- the Romans certainly knew of this boat and it seems both incredibly widespread in design and very, very ancient.
Does anyone know of other references to coracle like craft in the Ancient world between Egypt and Britannia?