also: ごだいよう
noun
the five oceans
Refers collectively to the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. Often used in geographical contexts.
世界の五大洋をすべて航海した船乗りがいる。
There are sailors who have sailed all five oceans of the world.
七大陸 refers to the seven continents, while 五大洋 refers to the five oceans.
Compound of 五 (five), 大 (great), and 洋 (ocean). The reading ごたいよう follows standard on'yomi, while ごだいよう is an irregular voiced variant.