Whats the agricultural density for china?

Although China's agricultural output is the largest in the world, only about 15% of its total land area can be cultivated. China's arable land, which represents 10% of the total arable land in the world, supports over 20% of the world's population. 

Cause of he different elevations  hope this ?

Did you know it's illegal to own only one guinea pig in switzerland?   : )