Rhino Head is the limestone headland that closes the western end of Marion Bay, named for its profile when seen from the lookout in Dhilba Guuranda-Innes National Park. The Marine Life Society describes the reefs here as offering a variety of diving in 10-15 m, with low caves and undercuts filled with gorgonia, sponges and a variety of marine life. The undercut limestone creates shaded overhangs where filter feeders thrive – gorgonian fans, sponges and ascidians – and these shelter fish such as blue devils, bullseyes, magpie perch and zebrafish, while western blue groper, sweep and old wives patrol the reef top.

Crayfish and octopus use the holes. Rhino Head is also the site of one of the area's best-known wrecks: the steel collier Willyama struck this reef in 1907 when her master mistook his position, and her remains lie nearby off Pelican Point. Divers commonly combine a reef dive at Rhino Head with a shallow second dive on the wreck.

The site is quick to reach from Marion Bay and slightly more sheltered than the western Innes sites, making it a good option on moderate days. It suits Open Water divers with some experience of current and surge. Because the headland takes the edge off westerly swell, it is often workable when the sites further west towards Cape Spencer and The Gap are not, so it makes a useful plan B on Innes boat days.

Take a torch to look under the ledges, where crayfish and octopus shelter, and keep an eye on the boat traffic running in and out of Marion Bay. The Rhino Head lookout, on the park road, is a good place to assess the sea before launching.

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). Launch at the Marion Bay ramp and run a few minutes west to Rhino Head; the Willyama wreck lies close by off Pelican Point, so the two are often combined. The headland can be viewed from the Rhino Head lookout in the park.

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. Currents around the headland can be noticeable on spring tides.

Drop onto the limestone reef at 10-12 m, follow the undercuts and low caves along the headland, and shallow up before returning to the boat or drifting to a pick-up.

No operator; private boats and club trips, often combined with the Willyama.