Brewer's: Cantabrian Surge
The Bay of Biscay. So called from the Cantabri who dwelt about the Biscayan shore. Suetonius tells us that a thunderbolt fell in the Cantabrian Lake (Spain) “in which twelve axes were found.”
She her thundering army leads To Calpê [Gibraltar] ... or the rough Cantabrian Surge.
Akenside: Hymn to the Naiades.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894