The wall off Parker Point is Rottnest's most straightforward wall dive and sits within the Parker Point Sanctuary Zone, set aside to protect the island's unusual pocillopora coral. The UWA Underwater Club describes an east-west wall with its top at about 5 m and bottom at 10 m, with crayfish commonly found in its cracks; marinelife.org.au describes the drop-off as a reef top at 4-5 m falling to a peaceful ledge at 10-12 m, then a wall that can be followed west past numerous gutters, ledges and overhangs, with deeper sponge gardens toward 22 m.

The Leeuwin Current brings warm water to this corner of Rottnest, and the fish life is a mix of temperate and tropical species. Expect buffalo bream, sweetlips, morwong, squirrelfish, rock cod, wrasse and bullseyes along the wall, with western rock lobster (fully protected here) in the cracks and hard corals on the shallower reef. Visibility is often very good.

The dive suits Open Water divers who can manage a moderate current and want an easy-to-navigate wall; the deeper sections give Advanced divers more to explore. It pairs naturally with the Parker Point snorkel trail and Little Salmon Bay on shore, and with Crystal Palace to the east. Avoid anchoring on reef, and take care with fins near corals, which are the reason for the sanctuary zone. The site is also a good place for a second dive after Crystal Palace, because the shallow ledge allows a long, relaxed profile after a deeper first dive. Photographers will find the coral and sponge colour best on the reef top in the morning light, and the sheltered shallows are a good spot for the safety stop.

Charters from Fremantle (Perth Scuba, Bucket List Diver, Dolphin Scuba) run to the south coast in 50-70 minutes. Private boats launch at Fremantle or Woodman Point; use public moorings in the Parker Point/Little Salmon Bay area where available and do not anchor on the sanctuary-zone coral reef. Experienced divers sometimes swim out from the Parker Point shore (Island Explorer Stop 5), but the wall is a long way out.

Slightly exposed: the shallow reef has crashing swell and the outer drop-off needs very calm days (marinelife.org.au). Best in northerly and north-easterly winds with low southerly swell, usually summer mornings. Prone to strong currents at times.

General pattern at Rottnest: summer brings calm morning easterlies followed by a strong south-westerly sea breeze from late morning, so dive early; winter brings north-westerly fronts and large swell, with clear, calm spells between them. Check the Bureau of Meteorology coastal forecast for swell height and period before committing.

Descend onto the reef top at 5 m, drop over the wall to the ledge at 10-12 m and follow it west past gutters, ledges and overhangs; deeper divers can visit the sponge gardens toward 20 m. Turn at half gas and return along the wall top.

UWA Underwater Club regular site; Perth charter boats use it on the south side in northerly conditions. Nearest dive services: Perth Scuba, Bucket List Diver and Dolphin Scuba (Perth/Fremantle) run Rottnest boat trips; there are no dive shops or air fills on the island.