The Great Sandy Strait is a 70 km sand passage estuary separating mainland Queensland, from World Heritage listed Fraser Island. The strait stretches from Tin Can Bay, North to Hervey Bay.
A complex landscape of mangroves, sandbanks, intertidal sand, mud islands, salt marshes and seagrass beds, the Strait is an important habitat for breeding fish, crustaceans, dugongs, dolphins and marine turtles. The Mary River enters the strait at River Heads, near Hervey Bay.
The lower part of Great Sandy Strait was listed under the Ramsar Convention as a wetland of international significance in 1999. The area is also an important roosting site for CAMBA and JAMBA listed species.