Zhalong wetland is the largest wildness area in protecting crane in China, but problem now it is confronted with serious water contamination problem.

• 扎龙湿地是目前我国最大的以丹顶鹤等大型水禽为主的湿地生态类型的国家级自然保护区,但扎龙湿地存在严重的水污染问题。