Meet the site
Shelly Beach is the entry point for Cabbage Tree Bay, a 20-hectare no-take aquatic reserve declared in 2002 that stretches from the southern end of Manly Beach around Fairy Bower to the tip of the Shelly headland, and it is by a wide margin the most dived and snorkelled patch of water in New South Wales. The bay faces north-west, so the prevailing southerly swell passes it by, and the beach is a small crescent of coarse sand with a kiosk, a car park and a headland walk above it. The dive begins over white sand and seagrass at 2–3 m and follows a reef of small tumbled boulders and flat ledges around the headland, deepening gradually to 7–8 m and then 10–12 m; off the point, experienced divers can push north-west onto a deeper, more broken reef at 14–16 m and the outer bommie. Michael McFadyen, writing from a lifetime of southern-Sydney sponge diving, found the reef itself dull – no sponges, no gorgonians, no sea tulips – and that is fair: Shelly is a fish dive, not a scenery dive. Since protection, more than 160 fish species have been recorded and John Sear's iNaturalist survey lists over 360 species of all kinds. Blue groper the size of labradors follow divers; wobbegongs lie in every second gutter; Port Jackson sharks pile up under the ledges from July to September; dusky whalers, small and harmless, have summered here in groups of up to twenty since 2003; giant cuttlefish court in the kelp in winter; eagle rays, fiddler rays and bull rays cross the sand; kingfish, salmon and bonito hunt the schools of yellowtail; octopus, squid and nudibranchs fill the cracks; and each autumn the East Australian Current brings juvenile tropical fish that shelter in the boulders until the water cools. Weedy sea dragons, once reliable in 'Weedyland' at the northern end of the bay, all but vanished after the March 2022 swells and are now a rare treat. It is the standard Open Water training site for every Manly operator, a superb night dive, and busy at all hours; the price of the fish life is crowds, a full car park by 8 am and snorkellers overhead. Shelly suits everyone from first-timers to macro photographers, and it is the reference against which the rest of Sydney's shore diving is judged.
What you might see
Blue groper, dusky whaler sharks (summer), Port Jackson sharks (winter), wobbegongs, giant cuttlefish, eagle rays, fiddler and bull rays, kingfish, yellowtail, octopus, squid, nudibranchs, juvenile tropical fish (autumn), weedy sea dragons (rare), 360+ recorded species
Location
West-facing sandy beach at the southern end of Cabbage Tree Bay Aquatic Reserve, with a boulder-and-ledge reef running north and east around the Shelly headland from 2 m to 12 m (16 m off the point); Sydney's most popular shore dive and snorkel.
Facilities nearby
Two-level paid car park at Shelly Beach (about $8/hour, full by 8 am on fine weekends), free 2-hour street parking up Bower Street; toilets, cold showers and a gear-rinse tap at the beach, The Boathouse cafe/kiosk; air fills and hire at Dive Centre Manly (Belgrave Street, 10 minutes' walk) and Pro Dive Manly (Brookvale).
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
michaelmcfadyenscuba.infomichaelmcfadyenscuba.infodivesydney.com.auviz.net.audpird.nsw.gov.aufrogdive.com.audiveplanit.comRecord updated 26 Sept 2026. Source claims are being reviewed.