This thing is big and heavy and at one time floated around in the Caribbean.
Made entirely of metal, it’s like a huge beach ball with an open shaft running right through its center. At one time, a wooden pole or spike sat in the shaft and held some sort of light. When I googled 'old metal buoy' I came up with a picture that looks very much like what we're finding in the woods, labeled as an anti-submarine buoy.
Somehow these things washed ashore...and pretty far ashore, like hundreds of yards into the forest. How the hell that happened I don't know, but now that people are once more doing things along this section of Nicaragua’s Caribbean coast, these old buoys are being rescued.