articles - “The colour of (the) water(s)”

'Waters' in this context confuses me

First, let's look at two relevant definition/meanings of plural waters found in the Oxford Learner's Dictionaries.

3. waters [plural] – the water in a particular lake, river, sea or ocean

5. waters [plural] – an area of sea or ocean belonging to a particular country

I got it.

Now the confusion – what should replace 'X', 'Y', 'Z' in the example below: water or waters?

The color of (the?) X is magenta because at that place, (the?) Y of Indian Ocean and (the?) Z of South Atlantic Ocean which are red and green respectively meet.

Also, does it take the article the? Because in one official document from the Journal of Marine Research (American Government), I found this sentence (without the) -

...continues into the Indian Ocean while the rest of it mixes with water of Indian Ocean...