Got confused as to how to say that a particular location is so full of people, animals, etc. that I have never seen such a large number of them before.

- In the square there were the most peolpe that I have/had ever seen. (meaning 'more people I've never seen')

- There were the most frogs in the pond that I have/had ever seen.

Are these correct? They sound off to my non-native ear... If not, what's the most natural way to put it, apart from:
- In the square there were more peolpe than I have/had ever seen.

Hello, MichalS,

the most people that I have ever seen is vernacular and cumbersome. The same idea is correctly and clearly expressed by more people than I have ever seen, but, given that you do not wish to use this construction, here are some other lexical ways of saying virtually the same:

Never before have I seen so many people in the square.
The square was teeming with people.


Respectfully, Gleb Chebrikoff
It's crawling with them in the square... just kidding

I tried to say that in my mother language and found I didn't know how to say that in a single sentence... a good question!
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 Andriy Lapin's reply was promoted to an answer.
Thanks for the clarification!

The expression's struck me as kind of odd but I couldn't say what was grammatically wrong in it. I gather that it's ok as far as grammar is concerned but it's just that one doesn't normally talk that way (?)