Where can i find parks that allow primitive camping?

I am looking for national, state, or other parks that allow tent camping without set “campsites”. I want to be able to go in, hike and find a place to set up camp wherever I want. I would prefer lakes and rivers, but this is not crucial. Solitude and relaxation is what I am seeking. Does anyone know of any such parks? Does anyone know of a place online to search for this kind of camping? Thanks.

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