MiIln Reef, Great Barrier Reef, Australia

  • Milln Reef Location Latitude 16°47.5 Longitude 146°16
  • Depth 5-25 metres
  • Visibility 15 – 20 metres
  • Access boat
  • Size 370 hectares

Milln Reef is 56 kilometres east of Cairns.  This site offers good visibility and is popular with snorkelers and scuba divers.


Shallow coral gardens are outstanding for snorkelers. Along the coral Reef, you will see abundant brightly coloured tropical reef fish.

Scuba diving

Milln Reef offers excellent wall dives, pinnacles and swim-throughs. Milln is great for night diving. Some walls contain sleeping parrotfish in their mucus sacks, turtles, barracudas and the occasional bull ray.

Dive Sites

Milln Reef dive sites include Three Sisters and the Whale dive site.

Three sisters is a series of three large bommies at the back of this reef.  These sites include Whale Bommie, the Desert and Petaj, with Swimming Pools nearby.   The deepest of the three sisters is 33 metres off the sand on the Northeastern side.

Whale Bommie provides good diving with depths exceeding 20 metres. A great site to dive at night, where you can expect to see sleeping turtles, reef crabs, painted lobsters, soft corals and gorgonian fans.

Watch for a superb stand of black coral on the bommie’s deepest side.  Next, head to the east to see white-tip reef sharks.  The second sister is about 19 metres, which is ideal for divers to explore the base of this bommie.

While scuba diving in this location, see sand dwellers, including blue-spotted lagoon rays and sharks.

Close by to the second bommie is the third bommie, about 3 metres apart. Here you can see schools of fusiliers and snappers.   Scuba divers have your cameras ready to capture the brilliant yellow gorgonians that grow along this wall.

There is also a swim-through on the north side of the first of three sisters.

Prodive and Silverswift visit this reef site. Book your trip today to dive into this impressive reef site.

Milln Reef Map

FAQs Milln Reef

Q. What is Milln Reef known for?

A. Milln Reef is renowned for its breathtaking underwater beauty and vibrant marine life. It’s a popular destination for snorkeling and diving enthusiasts.

Q. How do I get to Milln Reef?

A. To reach Milln Reef, you can take a boat or join a diving tour departing from various ports along the Australian coastline. Make sure to check with local operators for the best options.

Q. What can I expect to see while snorkelling or diving at Milln Reef?

A. When you explore the waters of Milln Reef, you’ll be treated to a colourful display of coral formations, tropical fish, and even larger marine creatures like sea turtles and reef sharks.

Q. Is Milln Reef suitable for beginners in diving and snorkeling?

A. Absolutely! Milln Reef offers options for both experienced divers and beginners. Many tour operators provide guided experiences for those new to diving or snorkelling, ensuring a safe and enjoyable adventure.

Q. Are there any accommodations available on Milln Reef itself?

A. Milln Reef can be visited for an overnight stay on Cairns Liveaboard Prodive.

Q. What is the best time to visit Milln Reef?

A. The Great Barrier Reef, including Milln Reef, is a year-round destination. However, the best time to visit is during the dry season (from May to October) when the weather is pleasant and the water visibility is excellent.

Q. Are there any conservation efforts in place at Milln Reef?

A. Yes, there are ongoing efforts to protect and preserve the marine environment of Milln Reef. Tour operators and visitors are encouraged to follow responsible snorkeling and diving practices to minimize the impact on the fragile ecosystem.

Q. Can I take my own snorkelling or diving gear, or is it available for rent?

A. You can bring your gear, but most tour operators offer rental equipment for convenience. Make sure to confirm this with your chosen operator before your trip.

Q. Are there any age restrictions for snorkeling or diving at Milln Reef?

A. Age restrictions may vary depending on the tour operator and the type of activity. Some operators offer family-friendly experiences suitable for children, while others might have age limitations for certain diving activities.

Q. How can I book a trip to Milln Reef?

A. You can book a trip to Milln Reef through various tour operators affiliated with your Hot Getaways travel site. Check out the available options on this website and choose the one that suits your preferences.


Remember, experiencing the natural beauty of Milln Reef is a unique and unforgettable adventure that showcases Australia’s incredible underwater wonders. Enjoy your journey to this mesmerizing destination!

Great Barrier Reefs Nearby