Dear Thread, you have wound across the field of non-countable nouns just as any self-indulgent sewing thread winds around decent buttons until fixing them. Now, I hope you will find collecting the arguments pro "WATERS" acceptable; according to a BBC World Service Dictionary( Chief Ed. John Sinclair), the word 'waters' (plural + supp) means - A country's waters consist of the area of sea near it which is regarded as belonging to it. >The ship was in British waters.<
Also you may understand the idea of nouns uncountable yet to refer a large area used and set in plural (eg. GOODS, MEANS, WORKS) >... the black waters of the Thames...<
Some extra support from the Bible(=NIV) Genesis 1:2b >and the spirit of God was hovering over the waters.<
I am still wondering of your mother tongue yet to be shared - a fine quotation of Ezra Pound's poem (DOWRIA) offers a succulent hit as he wrote of >grey waters<.
Yours, Mihaly Mok - Budapest, Hungary