THE region's biggest visitors are making a splash in the waters off Facing Island and Curtis Island.
Humpbacks are travelling migratory patterns in large numbers not witnessed in several years.
And boaties and whale-watchers are urged to stay on the lookout for the majestic creatures.
The presence of humpbacks in local waters is a reassuring sign that populations are replenishing following bans on commercial whaling.
Marine ecology estimations expect 20,000 humpbacks will travel the coast line.
Dr Daniele Cagnazzi, a postdoctoral research fellow with Southern Cross University's Marine Ecology Research Centre, is on the water observing behaviours as part of the Capricorn Cetaceans Project.
"More than ever before it is very important to be careful while on the water and to always watch out for whales and any other marine wildlife in particular when travelling at high speed," he said.
Regulations for observing the spectacular creatures can be found at the Great Barrier Reef Marine Park Authority website.