Panjin Shuangtaizi River mouth state-level nature protection area (盘锦双台子河口自然保护区) preserves the most completed ecosystem and the biggest wetland in the world. More than 260 kinds of birds and 399 kinds of wild animals live in it. It was promoted to the state-level nature protection area in 1988 has applied to join the International person and biosphere protectorate network.