Meet the site
Lion Island is the distinctive sphinx-shaped island at the mouth of Broken Bay, visible from both the Central Coast and Sydney's northern beaches. NSW Marine Estate documents describe it as a nature reserve (originally a fauna reserve from 1956) surrounded by estuarine reef, and note that scuba diving and snorkelling are permitted within the 45-hectare zone extending 200 m from the island, while hand gathering and collecting would be prohibited under proposed special purpose zoning, and boat speed limited to 8 knots to protect the island's threatened little penguins. The island's rocky shores drop to estuarine reef, a habitat influenced both by the ocean and by the Hawkesbury River. Kelp and algae cover the shallower rocks, and sponges, ascidians and encrusting growth increase with depth. Fish include those typical of Broken Bay and nearby Barrenjoey: luderick, bream, silver sweep, yellowtail, red morwong, blue groper, leatherjackets and, in the deeper water, snapper and mulloway. Wobbegongs and Port Jackson sharks rest on ledges. Little penguins may be seen on the surface or underwater near the island, especially at dawn and dusk. The island also has cultural significance, with shell middens and spiritual sites valued by local Aboriginal communities. Detailed dive descriptions of Lion Island are scarce, and conditions in Broken Bay vary widely with tide and river flow. Divers need their own boat, should choose the lee side, and should plan around the tide. For those who make the effort, it offers an uncrowded, scenic reef dive at the meeting of the Hawkesbury River and the Pacific, and a chance to see penguins.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Lion Island (Broken Bay) is recorded as Island in Central Coast. The listed access is boat. 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.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- 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 Lion Island (Broken 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 Lion Island (Broken 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
Little penguins, luderick, bream, silver sweep, yellowtail, red morwong, eastern blue groper, leatherjackets, snapper, mulloway, wobbegong sharks, Port Jackson sharks, kelp, sponges, ascidians
Location
A rocky island nature reserve in the middle of the entrance to Broken Bay, between Box Head and Barrenjoey; the estuarine reef within 200 m of the island is open to snorkelling and diving, with special rules to protect its little penguin colony.
Facilities nearby
Departure ramps at Patonga, Ettalong or Palm Beach: parking and toilets.
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
marine.nsw.gov.aunationalparks.nsw.gov.auRecord updated 26 Sept 2026. Source claims are being reviewed.