A beautiful ancient city of Lijiang is located in the northwest of Yunnan Province of China. In 1997,it was listed as a UNESCO World Heritage Site. Yangtze River , was divided into three arm flows through Lijiang, a great number of picturesque bridges spanned across its crystal clear waters. The city has dozens of narrow cobblestone streets and alleys along these canals are drawn to water. Locals are not allowed to pollute the water, so it is very clean.