Meet the site
Jawbone Marine Sanctuary protects 30 hectares of coastal water at Williamstown, tucked between the suburb's swimming beach and the mouth of Kororoit Creek, and it is the only place in the inner west where a full sequence of Port Phillip habitats survives together: intertidal basalt from a Newer Volcanics lava flow, saltmarsh and mangrove-fringed lagoon behind it, seagrass meadows, boulder reef and patches of small kelp in the deeper water. Parks Victoria describes seagrasses, boulders and local kelp forests, and that is what a diver sees: a shallow, sheltered, complex bottom that is the best snorkelling in the western suburbs and a good shallow dive at high tide. The basalt boulders carry tubeworms, mussels, sponges and algae and hide crabs, shrimps, abalone, urchins, sea stars and nudibranchs; the seagrass holds pipefish, seahorses, juvenile fish, cuttlefish eggs and dumpling squid; and the fish include zebrafish, dusky morwong, leatherjackets, wrasse, blennies and juvenile snapper, with rays, fiddler rays and small sharks visiting from the sand outside. Because the sanctuary has been a no-take zone since 2002 it is a reference site for how the western shore looked before abalone and crayfish were fished out. The difficulties are access and depth: every entry means a walk along the Bay Trail and a scramble over slippery boulders, there are no facilities at all, and much of the sanctuary is under a metre of water at low tide, so this is a high-tide, calm-day, warm-season site more than a regular dive. The Scuba Doctor lists the sanctuary as a pointer to several entries, of which The Jawbone (East Point) is documented separately; this record covers the sanctuary overall and the western ground.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Jawbone Marine Sanctuary is recorded as Shore/Rock Platform in Melbourne & Port Phillip Bay. The listed access is shore. Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Jawbone Marine Sanctuary suitable for my certification?
The record lists Snorkel/Any. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Jawbone Marine Sanctuary through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Seagrass fauna (pipefish, seahorses, juvenile fish, dumpling squid), abalone, sea urchins, sea stars, crabs, nudibranchs, zebrafish, dusky morwong, leatherjackets, wrasse, blennies, juvenile snapper, rays, fiddler rays, small sharks
Location
30 ha marine sanctuary of basalt reef, seagrass and saltmarsh on the Williamstown shore of Port Phillip between Williamstown Beach and Kororoit Creek, 12 km from the CBD; this record covers the sanctuary as a whole and its western entries.
Facilities nearby
No facilities in the sanctuary; roadside parking on the Esplanade; toilets and cafes at Williamstown Beach; nearest air fills Dive Victoria Group
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
parks.vic.gov.auscubadoctor.com.auscubadoctor.com.auRecord updated 27 Sept 2026. Source claims are being reviewed.
