Where Is the Great Barrier Reef, and How Far Is It from Cairns?

Is Cairns on the Great Barrier Reef?

No. Cairns is on the mainland coast, and the reefs and islands lie offshore. You cannot stand on the Esplanade and see coral, and you cannot swim out to the reef from a Cairns beach: the sites the boats visit are many kilometres out to sea.

Cairns earns the “gateway” label because so many reef boats leave from its waterfront, a walk or short taxi ride from most central hotels. You do not need a car, a domestic flight or a night on an island to see the reef. A normal reef day runs from your hotel to the marina, out to the reef and back to Cairns by late afternoon.

If snorkelling straight off a beach matters to you, Fitzroy Island is the closest you get: its fringing reef starts at the island’s beaches, about 45 minutes from Cairns by ferry.

Distances and crossing times

Almost every boat leaves from the Reef Fleet Terminal at 1 Spence Street or the Marlin Marina fingers beside it, on the Cairns waterfront. Scenic flights leave from Cairns Airport or a heliport by the marina, depending on the operator.

The reef itself is vast, about 2,300 km long with more than 2,900 individual reefs, so “the reef” off Cairns is really a scatter of reefs and cays at different distances. Heart Reef, the famous heart-shaped one, is far to the south in the Whitsundays near Airlie Beach, and neither Cairns boats nor Cairns flights go there.

Travel time against time in the water

This is the table that tells you what you are buying. Times come from each operator’s own itinerary.

Prices are per person in US dollars as GetYourGuide quotes them. Weather and sea conditions can change sites and timings on the day.

What the numbers mean for your day

A half day gives you a real taste of the outer reef for the least time and money. Roughly half your trip is spent on the boat. On the All-Inclusive Half-Day Trip, that is two hours in the water out of a five-hour afternoon. Our half-day tours page lines them up.

A fast full day tips the balance firmly towards the water. The Silverswift Three Reef Sites tour takes 80 minutes to reach its first site, then spends around five hours across three outer reef sites, with only ten minutes between each, and a guided snorkel with a marine biologist at the last. Divers can fit up to three dives. It is back at the Reef Fleet Terminal by 4:30pm. The Outer Reef and Coral Cay Cruise goes further still with six hours at Upolu Reef on a 75-minute crossing.

A slower boat makes the ride part of the day. The Premium Catamaran Cruise takes about two hours each way on a sailing catamaran, with morning tea on the way out and the sails up on the way home when conditions allow. You get around four and a half hours at the reef, lunch included, and a gentler pace.

An island trip is the shortest crossing with the most time at your destination. Green Island and Fitzroy Island are both about 45 minutes away, and the full-day trips give you up to seven hours to snorkel from the beach, walk and swim. The reef around the islands is inner reef, closer to shore. See the Green Island and Fitzroy Island pages.

Six ways to visit the reef from Cairns

Pick the kind of reef day first and the boat second. These are the six main choices, from the shortest crossing to the longest stay.

An island: Green Island or Fitzroy Island

Green Island is a small coral cay 27 km from Cairns, and you step onto land: a sandy beach, rainforest, snorkelling, glass-bottom boats, walking trails, restaurants and a resort. The Green Island Cruise costs from $79 and is rated 4.4/5 from 2,010+ reviews. It suits families, mixed groups and anyone who wants the reef without making the whole day about snorkelling. If the best possible snorkelling or diving is your priority, compare it with an outer reef trip first; our guide asks whether Green Island is worth visiting.

Fitzroy Island, about 29 km out, is a granite continental island, mostly national park, with real walking trails, viewpoints, Nudey Beach and snorkelling from the shore. The Fitzroy Island Full-Day Trip costs from $76 and is rated 4.5/5 from 2,040+ reviews. Choose it if your ideal day is snorkelling, a beach and a rainforest walk. As with Green Island, you are choosing an island day first.

An outer reef day boat

For many visitors asking where to see the reef from Cairns, this is the answer they want. Outer reef boats head for offshore reefs such as Moore, Norman, Hastings, Saxon, Flynn, Milln and Thetford, with sites chosen by the operator and the day’s conditions. The reef is the whole day: several snorkel sites, scuba dives, guided snorkels, sometimes a semi-submersible or glass-bottom boat. There is usually no beach. The Outer Reef Full-Day Tour with Lunch costs from $193 and is rated 4.7/5 from 1,780+ reviews. If you are travelling to Australia to snorkel the Great Barrier Reef, look at the outer reef first.

An outer reef pontoon

A pontoon is a large platform moored beside an outer reef, a base for the day. One person can dive, another snorkel, a child can use a netted swimming area, and a non-swimmer can sit in the underwater observatory or ride the semi-submersible. You step into the water from stable stairs, not off the side of a boat. The Sunlover Moore Reef pontoon day costs from $200 and is rated 4.5/5 from 400+ reviews. With something for every age and ability, pontoons are one of the best choices for families spanning three generations; our guide asks whether pontoon tours are worth it.

A small boat or multi-reef cruise

Many smaller boats skip the pontoon and visit two or three reef sites, which gives you variety and feels more adventurous. They suit confident swimmers and people who dislike crowds, and suit non-swimmers, small children and anyone who needs plenty of shade or indoor space less well. A smaller boat does not mean a better reef: the sites, the conditions, the group size, the snorkel support and your time in the water matter more. The Silverswift above is the fast multi-site choice.

A scenic flight

Underwater you see coral and fish in detail but not the scale. From the air the reefs show as huge turquoise shapes in deep-blue water, and the size of the system makes sense. A flight adds to snorkelling; it does not replace it, because you see nothing of the life below the surface. Cairns has fixed-wing flights, helicopter flights, and boat-out, fly-back combinations. The Reef Cruise and Helicopter Flight costs from $309 and is rated 4.6/5 from 1,200+ reviews; with a bigger budget, a boat day plus a flight gives you both views of the reef in one day.

A liveaboard

A liveaboard is a boat you sleep on at the reef, so you snorkel or dive at sunrise, after the day boats leave and at night. The Coral Sea Dreaming 2-day liveaboard costs from $470 and is rated 4.6/5 from 110+ reviews. Our guide asks whether Great Barrier Reef liveaboards from Cairns are worth it for you.

Which one to choose

What “outer reef” means, and whether it is the real reef

Cairns tour sellers say “outer reef” constantly and rarely explain it. The Great Barrier Reef is not one narrow strip parallel to the beach; it is spread across the continental shelf. The outer reef means the reefs further offshore, towards the outer edge of that shelf, as opposed to the inner reefs around Green Island and Fitzroy Island.

In practice, an outer reef trip usually means the reef is the main attraction, there is little or no land to explore, you spend most of the day snorkelling or diving, the water around you is deeper, and the crossing is longer. It does not mean every outer reef site beats every inshore site on every day. Wind, tide, visibility and the state of each reef all matter.

Green Island is the real Great Barrier Reef: it is a coral cay inside the Great Barrier Reef Marine Park. Fitzroy Island’s fringing reef is part of the marine park too, and so are Moore Reef and the Ribbon Reefs. They are different parts of one system. When people call the outer reef the “real” reef, they mean it feels more reef-focused, further from land, with bigger stretches of coral and nothing on land to distract you. That may be what you want, but it is a travel preference, not geography. Our outer reef vs Green Island guide puts the two side by side.

Getting there by air

A scenic flight is the quickest way to reach the reef. The Outer Edges Scenic Flight (our breakdown) is over Green Island within about ten minutes of leaving Cairns, then continues over Arlington Reef, Oyster Reef and Upolu Reef on a 30- or 40-minute flight. The 40-Minute Window-Seat Scenic Flight (our breakdown) leaves from Cairns Airport, and the 30-Minute Helicopter Flight (our breakdown) from Marina Point on the Cairns waterfront. Our scenic flights page compares them.

Without a boat or a plane, the only other way to reach the reef is to stay on Green Island or Fitzroy Island and snorkel from the beach. For most visitors a boat is still the simplest and most complete way to see it.

Seasickness on the crossing

The outer reef crossing is open water, and on a windy day it can be rough. Reviews on several boats mention choppy rides and seasick passengers, followed almost always by praise for how the crew looked after them. A few things help.

Take your remedy before you board, as the packet directs. Some boats sell travel sickness tablets on board, including the Moore Reef pontoon boat, but by the time you feel queasy it is late to start.

Pick a shorter crossing if you know you suffer. Green Island and Fitzroy Island are about 45 minutes away. The Frankland Islands River, Rainforest and Reef Tour (our breakdown) starts with a coach south and a 30-minute cruise on the calm Mulgrave River before a short open-water crossing to the islands.

Check the suitability list. The fast half-day boats from Reef Adventures and Pure Snorkelling list people prone to seasickness among those they do not suit.

Look at the marine forecast the day before, and book your reef day early in your trip so there is room to move it. Our best time to visit guide covers the seasons.

Cairns, Port Douglas or the Whitsundays?

The reef runs for more than 2,000 km beyond the Cairns region, so other towns are gateways too.

Cairns has the widest choice: its own international airport, Green Island and Fitzroy Island close by, many outer reef boats, pontoons, scenic flights and liveaboards, and rainforest day trips as a second attraction. Port Douglas, about an hour north, is a smaller resort town whose boats head for the Agincourt Reefs; our Cairns or Port Douglas guide compares the two bases.

The Whitsundays, reached through Airlie Beach and Hamilton Island far to the south, are also on the reef, but the trips there lean towards sailing, island scenery and Whitehaven Beach. Choose the Whitsundays for sailing and islands, and Cairns if the reef itself is the priority and you want the most choice with the least travel.

How many days to give the reef

One full day is enough for a real Great Barrier Reef experience. You can reach the outer reef, snorkel or dive for several hours and be back in Cairns that evening.

One day

Base the choice on your priority:

• Mostly coral and snorkelling: an outer reef trip.
• Reef, beach and island: Green Island.
• Reef and hiking: Fitzroy Island.
• Cannot swim: an outer reef pontoon.
• Certified diver: a dive-focused outer reef boat.
• The biggest visual impact: an outer reef cruise plus a scenic flight.

If you know nothing else about your group, a full-day outer reef trip is the safest first choice, because it puts the reef itself at the centre of the day.

If you want variety in one day, two combination trips split it between an island and the outer reef. The Green Island and Outer Reef Pontoon Day Trip ($219, 4.6/5 from 110+ reviews) gives you two hours on Green Island, then three hours at the Moore Reef pontoon. The Moore Reef and Fitzroy Island Boat Tour ($200, 4.6/5 from 240+ reviews) goes to the Moore Reef pontoon first, then Fitzroy Island for lunch and the beach. You get two settings in one day, with less time at each, so if snorkelling is your priority, take a full outer reef day instead.

Two days

Spend day one on the outer reef, snorkelling or diving, and day two on Fitzroy Island or Green Island, with beaches, walks and easier snorkelling. Two different reef days work better than two similar outer reef cruises, unless you are a keen diver.

Three days

Add the Daintree Rainforest and Cape Tribulation as day three. Cairns sits between two World Heritage areas, the reef offshore and the Wet Tropics rainforest inland, so you do not need to spend every day on a boat.

Staying overnight on the reef

You can sleep out on the reef in three ways: at the island resorts on Green Island or Fitzroy Island, on a liveaboard that stays at the outer reef while transfer boats bring guests out, or on a multi-night dive expedition to more distant reefs. For keen snorkellers and divers, a night out there changes the trip, because you can be in the water outside the day-trip hours. Our liveaboard guide compares the boats, prices and cabins.

How the reef is protected

UNESCO listed the Great Barrier Reef as a World Heritage site in 1981, as the world’s most extensive coral reef ecosystem. The World Heritage listing records about 400 types of coral, 1,500 species of fish and 4,000 types of mollusc in the World Heritage area.

Most of the reef lies inside the Great Barrier Reef Marine Park, which uses zoning to decide what is allowed where: some zones ban fishing, others allow particular uses. The Cairns area also has its own plan of management that controls tourism use, boat sizes and visitor numbers at particular reefs. On a licensed tour you do not need to study the zoning maps; if you take your own boat out or go fishing, you do.

What marine life can you see from Cairns?

Nothing is guaranteed, but sightings around Cairns reef sites include green and hawksbill turtles, parrotfish, butterflyfish, damselfish, clownfish, giant clams, reef sharks, rays, Maori wrasse, barracuda, dolphins and, in season, whales. Six of the world’s seven species of marine turtle live on the Great Barrier Reef. Our full guide to Cairns reef marine life covers where and when each animal is most likely.

You do not need to scuba dive to see most of this. Coral grows close to the surface at many sites, so snorkellers get good views of coral, fish, giant clams and often turtles; for most first-time visitors, snorkelling is enough. A day trip shows you a small sample of the reef, and not knowing what you will meet is part of the fun.

Book by answering five questions

Searching “Great Barrier Reef tour” and booking the first result is the easiest mistake to make. Answer these five questions first:

1. Do I want an island or an offshore reef?
2. Is snorkelling or diving my main priority?
3. Can everyone in my group swim confidently?
4. Do I want one reef site or several?
5. How much time on a boat am I comfortable with?

For most first-time visitors the answers narrow the choice to four trips: Green Island for an easy island day with a beach, Fitzroy Island for hiking and shore snorkelling, an outer reef boat for the best snorkelling and diving, or an outer reef pontoon for families, non-swimmers and mixed groups. Scenic flights, liveaboards, small boats and introductory dives can be added once you know which of those four suits you. Our tour chooser matches the trips to each kind of traveller.

Frequently asked questions

Where exactly is the Great Barrier Reef?

In the Coral Sea, off the north-east coast of Queensland, Australia. It stretches about 2,300 km from near the tip of Cape York to waters north of Bundaberg.

Is Cairns on the Great Barrier Reef?

No. Cairns is on the mainland, and the reef lies offshore. It is one of the reef’s main gateway cities, with boats leaving the waterfront every morning for islands, coral cays and outer reefs.

How far is the Great Barrier Reef from Cairns?

Green Island is about 27 km from Cairns and Fitzroy Island about 29 km. The outer reef sites are further out; Moore Reef, for example, is about 45 to 50 km offshore.

How long does it take to get to the Great Barrier Reef from Cairns?

About 45 minutes by fast catamaran to Green or Fitzroy Island, and about 1.5 hours to Moore Reef. Most outer reef boats quote 75 minutes to two hours to their first site, and our day-trip guide shows what the day looks like once you get there.

How long will I spend in the water on a Cairns reef trip?

From about 1.5 hours on a four-hour half day to six hours on the Outer Reef and Coral Cay Cruise. Most full days give you around four to five hours at the reef.

Can you swim to the Great Barrier Reef from a Cairns beach?

No. The reef sites are many kilometres offshore. For snorkelling straight off a beach, take the ferry to Fitzroy Island, where the fringing reef starts at the shore.

Is Green Island part of the Great Barrier Reef?

Yes. Green Island is a coral cay inside the Great Barrier Reef Marine Park, and Fitzroy Island’s fringing reef is in the marine park too.

What is the outer Great Barrier Reef?

The reefs further offshore, towards the outer edge of the continental shelf. From Cairns you reach them on a full-day boat, and they are the main choice for snorkelling and scuba diving.

Can you see the Great Barrier Reef from Cairns airport?

Not from the terminal, but scenic flights leave from Cairns Airport and reach the reef within minutes. The Outer Edges Scenic Flight is over Green Island about ten minutes after take-off.

Can you visit the Great Barrier Reef without swimming?

Yes. Choose a trip with a glass-bottom boat, a semi-submersible or an underwater observatory, or take a scenic flight. Outer reef pontoons suit non-swimmers best.

Should I visit the Great Barrier Reef from Cairns or Airlie Beach?

Cairns has more reef-focused day trips, diving and quick outer reef access. Airlie Beach is the base for Whitsunday sailing, island scenery and Whitehaven Beach.

Is Heart Reef near Cairns?

No. Heart Reef is in the Whitsundays near Airlie Beach, a long way south. Cairns cruises and flights do not reach it.

Want the most reef for your crossing? Check availability on the Silverswift, with three outer reef sites in one day.