Scoglio a Penna is a distinctive rock formation that closes the eastern end of Ieranto Bay on the Sorrento Peninsula, rising from the Punta Campanella Marine Reserve's Zone B. The rock takes its name from its feather or quill shape, and the dive follows a circuit around its perimeter, beginning with a shallow crevasse covered in yellow-orange parazoanthus that creates photogenic light plays, then transitioning down the wall where Eunicella singularis corals, red and yellow gorgonians, and dense paramuricee colonies build from mid-depth toward the outer face. The site sits in the corridor between the Gulf of Naples and Gulf of Salerno, which brings nutrient-rich currents and regular pelagic traffic alongside the resident reef community. Diving requires prior authorization from the AMP Punta Campanella office and is most practical with a local dive operator given the boat-access-only approach.