Anyone knowledgeable about stuff around the SoCal ocean area.

On the beach, below the cliffs (near the start of them from flat beaches) north of San Diego.

+/- 4' diameter. Concrete, ring shaped, iron/steel straps attached somehow?

Open center to me would appear to be for a piling or such to go through. Maybe some sort of a dock deck weight to pull it back down the pilings after the tide goes back out????

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The desert is a true treasure for him who seeks refuge from men and the evil of men.
In it is contentment
In it is death and all you seek
(Quoted from "The Bleeding of the Stone" Ibrahim Al-Koni)

member of the cabal of dysfunctional squirrels?