The term 'Australia Lake' is composed of six crossword solutions: EYRE (4 letters), Adelaide (8 letters), EMU (3 letters), Perth (5 letters), Sydney (6 letters), and OPAL (4 letters). EYRE is a large salt lake in South Australia, located in the state's Far North region. Adelaide is the capital city of South Australia and the fifth-most populous city in Australia. EMU is a large flightless bird native to Australia. Perth is the capital and largest city of Western Australia. Sydney is the state capital of New South Wales and the most populous city in Australia. OPAL is a precious gemstone found in Australia, which is known for its unique play of color.