Re: To stop some of the unfounded rumors...
to me jungle or tropical ground water run off is not "Black" water, "brackish" yes

Brackish and black water are not the same...Brackish water is both salt and fresh water and may or may not be brown (black water)...I have been way up the Black River to where it is totally un-salted and it is still "Black water" but not brackish as it is past where the inland tide reaches it. Black water is what some of us that have lived in the swamp or close to it call it. I lived inland in Savannah way past any salt or brackish water and our river flowed from the Ogichee
swamp. We lived on the Little Ogichee River and it was exactly the same color as the negril River and Black River in Jamaica. Totally "clean' but stained. We were at least 25 miles from the sea and no salt water at all...Black water is merely a term we used but like Yvonne said will look like tea or evern darker....It is natural color from the tanic acid in the leaves. This is where the color in the Negril River comes from and not from your use of the term black Water...