Meet the site
Fourth Sister is an underwater extension of the Three Sisters islets near Ulverstone - about 300 m long and 70 m wide on average - that terminates in a pinnacle rising to within 3 m of the surface. The Marine Life Network guide rates it 6 out of 10: 10-18 m, with a slight current that enhances filter-feeding animals and fish schools. Bastard trumpeter, sea sweep, long-finned pike, large schools of barber perch, southern hulafish, leatherjackets and wrasse are recorded, along with gorgonian fans, many of which appeared dead, and the guide notes pollution and siltation concerns. The Leven Scuba Club describes a 300 m reef ending in a pinnacle, affected by current and visited by pelagics. Local knowledge from Leven Scuba Club members is the best way to get the most out of it, and first-time visitors should ideally dive it with someone who knows the site and the tide.
The central north coast between Wynyard and Port Sorell is the home water of the Leven Scuba Club at Ulverstone, whose site list is the main modern source for it, supplemented by the older Marine Life Network guide. The towns of Burnie, Ulverstone and Devonport sit right on the coast, so many sites are within minutes of a ramp or car park, but the reefs are generally low and weedy, visibility is often 5-10 m, and the coast is open to Bass Strait's northerly and westerly weather.
Devonport is the Spirit of Tasmania ferry terminal, which makes these sites the first and last dives for many interstate visitors bringing their own gear. There is no hyperbaric chamber in the north - the nearest is the Royal Hobart Hospital, about 3.5 hours' drive - so dive conservatively, especially on the deeper offshore sites.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Fourth Sister (Ulverstone) is recorded as Reef in Tasmania North & North-West. 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.
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 Fourth Sister (Ulverstone) 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 Fourth Sister (Ulverstone) 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
Bastard trumpeter, sea sweep, long-finned pike, barber perch, southern hulafish, leatherjackets, wrasse, gorgonians
Location
An underwater reef extension about 300 m long off the north-western tip of the Third Sister islet near Ulverstone, ending in a pinnacle within 3 m of the surface.
Facilities nearby
Ulverstone: ramp, shops, fuel, accommodation.
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
levenscubaclub.com.aumarinelife.org.auRecord updated 26 Sept 2026. Source claims are being reviewed.