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????