Meet the site
Green Island sits in the middle of the D'Entrecasteaux Channel off Middleton, halfway between the Tasmanian mainland and Bruny Island. The Marine Life Network guide describes a mud and shell-grit bottom in 5-10 m with rocky outcrops, thin seaweed growth and an interesting variety of birdlife, and calls the island very beautiful. It notes poor water exchange, which can reduce visibility. Underwater the outcrops host thin seaweeds, sponges and sea squirts, with wrasse, leatherjackets and small reef fish, while the shell-grit flats between them are home to sea stars, hermit crabs, flathead and, occasionally, rays. The site is quiet and gentle, a pleasant shallow dive for divers with a small boat exploring the middle channel. It is not a spectacular reef, but it offers a relaxed dive in a lovely setting, and the birdlife – shorebirds and seabirds using the island – adds to the outing. Do not land on the island or disturb nesting birds. Combine it with a dive at Zuidpool Rock to the south for a more varied day in the channel. The middle channel is heavily used by salmon farms, mussel leases and recreational boats, so check charts for aquaculture lease boundaries and keep clear of pens and moorings. Visibility is best on a calm, dry day with an incoming tide from the south. A sounder helps locate the outcrops, which are small and scattered. Green Island is a good destination for a family snorkel from a small boat, and for new divers wanting a sheltered, shallow first boat dive.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Green Island (D'Entrecasteaux Channel) is recorded as Island in Bruny Island & D'Entrecasteaux Channel. The listed access is boat (day trip). 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.
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 Green Island (D'Entrecasteaux Channel) 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 Green Island (D'Entrecasteaux Channel) 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
Thin seaweeds, sponges, sea squirts, wrasse, leatherjackets, small reef fish, sea stars, hermit crabs, flathead, rays; shorebirds and seabirds
Location
Small island in the middle of the D'Entrecasteaux Channel off Middleton, with a mud and shell-grit bottom and rocky outcrops in 5-10 m.
Facilities nearby
Middleton boat ramp; shops at Middleton/Gordon limited; fills in Kingston or Hobart.
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
marinelife.org.auRecord updated 26 Sept 2026. Source claims are being reviewed.