Sentence:  It was night on this hemisphere , but the light blazed from the megalopolises of <WSD>Australia</WSD> , Japan , China , Southeast Asia , India , Siberia . 
Meaning of the word marked with <WSD> tags:  a nation occupying the whole of the Australian continent; Aboriginal tribes are thought to have migrated from southeastern Asia 20,000 years ago; first Europeans were British convicts sent there as a penal colony