Meet the site
Cape Willoughby is the eastern tip of Kangaroo Island, where South Australia's first lighthouse was lit in 1852 to guide ships through Backstairs Passage.
The cape faces the open junction of Backstairs Passage and the Southern Ocean. Tidal streams run hard around the point, and swell from the south and south-east breaks on the rock platforms. Underwater, divers can expect granite and limestone reef with kelp and brown algae, ledges and boulders sheltering rock lobster, and the fish of current-swept headlands – sweep, salmon, trevally, kingfish and western blue groper. Sea lions and fur seals range along this coast, and the same currents that bring fish also bring larger predators.
Nearby Antechamber Bay, to the north-west, is more sheltered and holds the remains of the schooner Kona, and Penneshaw offers easier shore diving. The Cape Willoughby lighthouse is open for tours, with cottages available to stay in. For experienced divers with a boat, calm weather and good knowledge of the tides, the cape could offer lively, fishy reef diving; for others it is a place to visit on land. Visiting divers who want to try it should seek local knowledge first – the island's fishers and the Kingscote dive shop know the tides and landing spots. Carry a DSMB and signalling device, and brief a shore contact on your plan before entering the water.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Cape Willoughby is recorded as Reef in Kangaroo Island. The listed access is shore or 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.
- 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 Cape Willoughby suitable for my certification?
The record lists Advanced 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 Cape Willoughby 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
Kelp, rock lobster, sweep, salmon, trevally, yellowtail kingfish, western blue groper; seals and sea lions possible
Location
The eastern tip of Kangaroo Island, marked by South Australia's first lighthouse (1852), facing Backstairs Passage; exposed reef and rock platforms.
Facilities nearby
Lighthouse car park, toilets, tours and heritage cottages at Cape Willoughby Conservation Park.
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
en.wikipedia.orgen.wikipedia.orgenvironment.sa.gov.auRecord updated 26 Sept 2026. Source claims are being reviewed.