HONG KONG - JULY 12: An aerial shot of Sham Shui Po where old residential buildings are densely built on July 12, 2014 in Hong Kong. Although Hong Kong is one of the world's metropolis and one of the most densely populated places in the world, about 40% of the land is country parks and nature reserves. (Photo by Lam Yik Fei/Getty Images) (Photo by Lam Yik Fei/Getty Images)
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