How do you say something like that?

"There's a thing for which I don't know what it is" "There's a thing where I don't know what it is" "There's a thing that I don't know what is"

or (the one which I hear people say a lot but sounds awkward:) "There's a thing that/which I don't know what it is"?

To be honest they all sound awkward to me to varying degrees

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[โ€“] 4 points 2 years ago

There's a thing I can't identify.

There's a thing I don't know about.

There's an unfamiliar thing.

All the formulations you wrote indeed sound either ungrammatical or unwieldy to me.

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