Talk:Speckled Stoneplate Ring (Dark Souls III)/@comment-89.76.173.108-20161222100025/@comment-3236835-20161222101458

There are two destroyable surfaces in the lake, one is a segment of floor near the center (which takes you inside the Demon Ruins), and the other is a wall to the left of this floor, where the ring is found.

There are other brick walls along the lake and perhaps they can be destroyed too. If that's the case, then it's possible you made the ballista break the wrong one.