"Vaisampayana said, 'Asked by thee, I shall tell thee all about the heroic-kings in Puru's line, all equal unto Indra in prowess, possessing great affluence and commanding the respect of all for their accomplishments.
"Puru had by his wife Paushti three sons, Pravira, Iswara, and Raudraswa, all of whom were mighty car-warriors. Amongst them, Pravira was the perpetuator of the dynasty. Pravira had by his wife Suraseni a son named Manasyu. And the latter of eyes like lotus-petals had his sway over the whole Earth bounded by the four seas. And Manasyu had for his wife Sauviri.
Although oceans are currently classified in to five, they are classified as four in history. (There is only one big ocean on the earth). This fact can be observed from the following two sources
Historically, there are four named ocean basins: the Atlantic, Pacific, Indian, and Arctic. However, most countries - including the United States - now recognize the Southern (Antarctic) as the fifth ocean basin. The Pacific, Atlantic, and Indian are the most commonly known.
For many years only (4) four oceans were officially recognized, and then in the spring of 2000, the International Hydrographic Organization established the Southern Ocean, and determined its limits. Those limits include all water below 60 degrees south, and some of it, like the Arctic Ocean, is frozen.
Do any scripture mention the names of the four oceans told by Vaisampayana?