Any very large body of (salt) water.

synonym: main.

Slightly salty (especially from containing a mixture of seawater and fresh water):
— The briny deep.

synonym: brackish.

Roget 392a: salty, salt, saline, brackish, briny; salty as brine, salty as a herring, salty as Lot's wife.    salty, racy (indecent) 961.