Uncountable nouns are usually used without an article. Superlatives require definite article. What comes out of these 2 rules when superlative meets uncountable article?
We need an example, I hope it is good:
This lake has clear water.
This lake has clearest water.
This lake has the clearest water.
When I searched the web I found both "clearest water" and "the clearest water".
I read on this site, that in informal speech the is frequently omitted, so let's concentrate on formal speech or writing. If there is Am/Br specific it would also be interesting. Please comment on the examples and in general. Thanks.