Penguin Point is a shallow Marion Bay site recorded by the Marine Life Society of South Australia, which describes a rocky bottom with caverns filled with coral-like growth, shallow blocks, plenty of small marine life and lots of gorgonia in about 6 m. Sites like this are common along the limestone coast of southern Yorke Peninsula: the rock erodes into blocks, undercuts and small caverns whose shaded roofs are colonised by gorgonian fans, sponges, ascidians and colonial hydroids, while the tops carry kelp and brown algae. Small fish – magpie perch, zebrafish, blue devils, wrasse and leatherjackets – move through the blocks, and the crevices hide crabs, nudibranchs and occasional crayfish.

Its shallow depth makes it suitable for newer divers and snorkellers on calm days, and it offers a gentle alternative to the more demanding boat sites of Innes. However, its exact location is not published and there is no operator, so it is effectively a local's site. Recorded here with low data confidence so that it is not lost from the regional list.

Ask in Marion Bay or at Adelaide shops that run Innes trips for directions. Because the depth is so shallow, a single tank can last well over an hour, and the site suits a relaxed macro dive with a compact camera. On calmer days it could also serve as an easy check-out dive before heading to the more demanding boat sites of the park.

From Adelaide drive about 300 km (3.5 hours) via Port Wakefield, Minlaton and Warooka to Marion Bay; Dhilba Guuranda-Innes National Park begins just west of the township (vehicle entry fee, pay online or at the Stenhouse Bay visitor centre). Penguin Point is described as a Marion Bay site by the Marine Life Society, but its position is not published; ask locally in Marion Bay. Shallow depth suggests it can be reached from a small boat launched at the Marion Bay ramp or, in calm weather, from shore over the rocks.

The southern tip of Yorke Peninsula faces the open Southern Ocean and Investigator Strait, so south-westerly and southerly swell is the controlling factor: most exposed sites need swell under about 1.5 m and are best after several days of northerly or north-easterly winds, which blow offshore along this coast. Winter cold fronts bring big south-westerly swell and strong winds and can close the area for days. Summer afternoon south-easterly sea breezes make boat runs rough, so launch early.

Visibility is typically 10-20 m in settled conditions but drops sharply with swell-driven surge. As a shallow rocky site, Penguin Point suffers badly from surge in any swell.

Explore the shallow limestone blocks and small caverns at 4-6 m, looking under overhangs for gorgonians and small life.

No operator; local and club divers only.