Give some stream of consciousness and then the answer. In early 2013, co-creator Jane Campion said that Top of the Lake comes to a distinct ending, and there would be no additional series. Despite this, it was announced in October 2014 that the series had been renewed for a second season. China Girl began shooting on location in Sydney, Australia in December 2015.

Answer this question: where was top of the lake china girl filmed?
The important part for answering this question is: China Girl began shooting on location in Sydney, Australia in December 2015.
Therefore, the answer is Sydney , Australia.