Meet the site
Astrolabe Cove – La Perouse Bay, or Larpa Bay to locals – is the shallow stretch of mainland shore between the Bare Island bridge and La Perouse Point, named for one of the two ships of the French expedition under Lapérouse that anchored here in January 1788, six days after the First Fleet. It is a modest but surprisingly rich dive that most people walk straight past on the way to the island. From the old boat ramp beside the bridge the bottom is sand at 3 m with a wall about a metre high; drifting north-west the reef edge runs along the shore and then west around the head of the bay, where the wall grows to four metres with small boulders and a few overhangs off it, and the depth settles at about 10 m along the edge. It is a critter dive. Big-belly seahorses cling to the sponges and sea squirts, red Indianfish and pineapplefish (knightfish) hide under the overhangs, blue-ringed octopus live in the shallows, weedy seadragons appear along the sand, and at night squid gather in numbers. The tidal flow along the shore changes direction from section to section but is never strong, and the dive is best done as a slow drift on the incoming tide, exiting back onto the platform after about 40 minutes or continuing around La Perouse Point on the Larpa drift. Visibility is the weak point – the head of the bay silts easily – and the local rock fishers are not always friendly. It suits divers who want an easy, sheltered macro dive or a night dive when Bare Island itself is crowded, and it connects the museum and monument precinct of La Perouse with the water in a way few Sydney dives do.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Astrolabe Cove / La Perouse Bay is recorded as Shore/Rock Platform in Sydney South & Botany 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.
- Lines and obstructions
- Discuss any known entanglement concerns and the suitability of the planned area.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
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 Astrolabe Cove / La Perouse Bay suitable for my certification?
The record lists Open Water. 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 Astrolabe Cove / La Perouse Bay 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
Big-belly seahorse, blue-ringed octopus, pineapplefish (knightfish), red Indianfish, weedy seadragon, squid (night), nudibranchs, sponges, sea squirts
Location
The mainland shoreline between the Bare Island footbridge and La Perouse Point, dived as a shallow drift along a 1–4 m reef wall in 3–10 m.
Facilities nearby
Free parking on Anzac Parade and the La Perouse loop (fills by 8 am on weekends), toilets at La Perouse, cafés and fish and chips at the loop, gear-up on the grass above the bridge; air fills at Abyss (Ramsgate) and Sydney Dive Academy (Matraville).
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.infoRecord updated 26 Sept 2026. Source claims are being reviewed.
