Endless ocean.
Meaning: This means a large body of salt water that has no end or is infinite. It's like saying, This body of water is so large that it seems to go on forever.
Choice of Words: Endless is an adjective that means something has no end or is infinite. Ocean is a noun that refers to a large body of salt water. Together, "Endless ocean" means a large body of salt water that has no end or is infinite.
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