Sediments in Broad Sound, Australia22S 150.3E
Broad Sound is a large bay on the east coast of Australia, in the state of Queensland 675 km northwest of the state capital, Brisbane. It is about 50 km long and 20 km across at its widest point. The Torilla Peninsula forms the eastern side of the bay; Shoalwater Bay is on the other side of the peninsula.
The bay has a low-lying coastline with wide mudflats exposed at low tide and backed by extensive areas of mangroves. The head of the bay has the greatest tidal range on Australia’s east coast – around 9 m. Here, sediments can be seen flowing out of the sound and into the ocean.
The coastline is punctuated by the mangrove-lined estuaries of several rivers and creeks, including Herbert and St Lawrence Creeks and the Styx River. Behind the mangroves is a hinterland of low, rounded hills covered by a mix of grassland and low eucalypt woodland or forest.