"The Hign Seas" - Origin

[Ponster]

why do we call the high seas the high seas ?

Is it anything to do with the height of the waves and where are the low seas … near the low countries ?

[Earl_Snake-Hips_Tucker]

High seas first attested c.1380, with sense (also found in the L. cognate) of “deep” as well as “tall.”

From here.