Generally speaking, by seven continents, we mean Asia, Europe, Africa, Oceania, North America, South America and Antarctica.

There is also a saying that the five continents, that is, the five Olympic rings, are: Asia, Africa, Europe, the United States and Australia!

There are only four oceans, namely, the Arctic Ocean, the Pacific Ocean, the Indian Ocean and the Atlantic Ocean.

The seven oceans mentioned in the animation "Saint saint seiya" were the Arctic Ocean, the Eastern Pacific Ocean, the Western Pacific Ocean, the Eastern Indian Ocean, the Western Indian Ocean, the North Atlantic Ocean and the South Atlantic Ocean. To put it bluntly, it is still four oceans, and there is no "eight oceans" as you said.