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Eastuarine wetlands are found where rivers start to join the sea. Their water is brackish (a mixture of salt and fresh water) and it rises and falls along with the tide. Mangroves grow in estuarine wetlands.

Billabongs are old river beds that are left when the river takes a different direction. When the new river floods or there is heavy rain, the billabongs fill with water.

Marshes and swamps can be found in many places. They are shallow, low lying areas of ground, filled with reeds and wildlife".