South Sea may refer to:

• The South Sea Company
• In the Netherlands: the former Zuiderzee, today's IJsselmeer
• The South China Sea
• The Pacific Ocean south of Panama
• In South Korea, it is sometimes used for the name of the East China Sea
• Often used in the plural, "South Seas," to designate all of the above.

"South Seas" may also refer to ANY seas South of the equator, Pacific & Indian Oceans.

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