Authors: Beaman, R.J.Publication: B.G. Lottermoser, P.W. Whitehead, P.N. Nelson and R.J. Beaman (Editors), Rocks, Landscapes and Resources of the Wet Tropics. Geological Society of Australia (Queensland Division), Brisbane, Australia, pp. 25-32. The Great Barrier Reef is a collection of many underwater habitats, from shallow seagrass beds to the clear waters and coral reefs of the outer shelf. They are connected through the currents that wash over them, and the animals and plants that use them for food and shelter during their life cycles. The varied seascape we see today has been moulded by changing climates, and the erosive power of water, over long periods of time. This chapter takes a tour of some of the main habitats found across the Great Barrier Reef, describing their formation and influence on the seascape, and how wildlife makes use of them.