The names are usefull, that’s why we named different Ocean an Sea. If you say there is a storm in the Indian Ocean, you know where that is. If you don’t name different part of the Ocean you would just say that there is a Storm in the Ocean and that’s completely usually. That’s like saying there is a storm on land, the planet is freaking large. We name bits of it, so when you talk about a region it’s easy to know where you are talking about.
While there is no distinct difference in that there is no line that says “here is the dividing line” it is still useful to give a general area. Saying “Hawaii is in the Pacific” is more descriptive than saying “Hawaii is in the Ocean”. Ocean just ends up being a bit to broad for some contexts, while specific coordinates are unnecessarily precise. That middle ground is where different names come in.
It’s a human convention, created at a time when we could not have known oceans were globally continuous. We have names for different countries even though they’re part of the same land mass, and we separate continents by name even though they’re joined together (Asia and Europe, e.g.). All the separation and naming arises from quirks if history and were useful when created (and still useful today). Many borders and delineations arise from geography or other natural phenomena, but many could have easily played out differently.
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