where can you find the best green tea in the world?

I was told by my brother in law who is a great lover of green Tea that good green tea is available in China! I really don't know the area where it is available! But I think in India also we get good quality of Green Tea in Darjeeling and I have read somewhere that the tea is considered to be quite an expensive one in the Worlkd tea market! If I am not wrong one type of tea from Darjeeling enjoys one of the best green teas in the world and it is said that tasters also don't want to spit the tea out instead they drink it because of its quaklity and cost factor! Some green tea is grown in Himachal pradesh and Assam two different states of India ! Thanks for the topic of discussion!