Why the One Sea Is Called Seas in the Plural

Yalkut Shimoni on Torah 8:3

All the seas are like a mikveh [a gathering of waters], as it is said: "And the gathering of the waters He called Seas" - these are the words of Rabbi Meir. Rabbi Yehuda says: The Great Sea is like a mikveh, and it is not called "Seas" except because there are many kinds of seas within it.

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