"Briny deep" is a poetic term commonly used to refer to the ocean. However, there are many other synonyms that can be used to describe this vast body of saltwater. One common synonym is "sea," which specifically refers to a large body of saltwater partially enclosed by land. Another synonym is "ocean," which is a larger and deeper body of saltwater covering most of the Earth's surface. "Blue water," "deep sea," and "open sea" are also commonly used synonyms for the ocean. Additional alternatives include "saltwater," "marine," "brine," and "the abyss." Regardless of the word chosen, the ocean remains a mysterious and awe-inspiring part of our world.