Dawa County and Panshan County of Panjin City are the largest river crab producing areas in China, known as "Crab Capital", which is directly related to the geographical environment of Panjin. The growth of river crab in Panjin is characterized by: born in seawater, grown in fresh water. Panjin facing the Bohai Sea, Liaodong Bay, there are vast areas of sea water, sufficient seawater, so that the river crab can be "born". At the same time, the inland sufficient freshwater resources and abundant water plants, and make the river crab to "long". Panjin is known as Liaoning "Southern Great Barren" reputation, the territory of swampy riverbanks and ponds dotted, large and small rivers crisscrossing, reed ponds millions of acres of continuous. More important geographic conditions, Panjin City, the territory of more than 20 small and medium-sized rivers, strip and the Bohai Sea connected, so that the river crab "born and long" back to the swim unimpeded.