Top Ten Seas by Area, 1 Philippine Sea, 2,000,000sq miles, 5,177,762sq kms.2 Coral Sea, 1,850,000sq miles, 4,791,000sq kms.3 Arabian Sea, 1,491,130sq miles, 3,862,000sq kms.4 South China Sea,...
If you want to include oceans, then the order would be:
Pacific Ocean 155.557 million km2 Atlantic Ocean 76.762 million km2 Indian Ocean 68.556 million km2 Southern Ocean 20.327 million km2 Arctic...