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= Erlong Lake = Er Long Lake is the largest reservoir of Jilin Province, located in the eastern part of Siping City. The total capacity of 1.762 billion cubic meters. There is rich in tourism resources, with unique natural landscape and historical and cultural landscape, the forest coverage rate of 96%.

Geography
Reservoir is located in the middle reaches of the East Liao River, above the dam site for the hilly areas, water system development, the tributaries mainly including Denggan river, Weijin River and Dalishuhe River. Reservoir area is a continental monsoon climate zone, hot and humid in summer, cold and snow in winter, the average annual temperature of 6 degrees Celsius, the average annual rainfall of 677.9 mm. Reservoir dam above the catchment area of 3799 square kilometers, the average annual flow of 15.2 cubic meters per second.

History
Erlong Lake ancient city ruins area is the most northern borders of the Warring States period, is so far to know this period of China's Central Plains system of the northern part of the ancient city of Chinese ruins, a representative of the late Warring States period cultural relics.

According to《comprehensive mirror for aid in government》. Erlong Lake is also the ruins of the ancient city of Heersu(赫尔苏). Heersu City is the center of ancient economic and cultural. However, in 1942, the Japanese had purpose to plunder agricultural products, develop paddy fields, product rice in the plains, and constructed the Erlong Lake reservoir. The ancient city - Heersu City was submerged in the reservoir, into an underwater city. But during every dry season, Heersu Temple and other ancient buildings can st ill reveal the water.

Attractions
Erlong Lake consists of erlong pavilion, the thousand Buddhas monastery and erlong mountain. It is mainly based on cable, chute, rock climbing paraglider and various kinds of cruise ships.

Erlong Lake surface is more than eight thousand hectares, rich in more than 20 varieties of fish and shrimp, like prawn, chub and weever. There are more wild vegetables, barbecue, and farm-house dishes to enjoy the clean green food, which has become a green food base.

Pollution
Erlong mountain reservoir pollution sources for the three aspects, point source pollution,diffused pollution, internal pollution. ⑴ point source pollution is mainly reservoir upstream towns such as Liaoyuan City, Baiquan Town, Xiaogushan Town and other industrial enterprises and domestic waste water discharged into the reservoir. ⑵ diffused pollution is mainly the surrounding areas of farmers to cultivate crops sprinkled pesticides, fertilizers and grazing excrement by soil erosion into the reservoir. ⑶ internal pollution is the siltation of the reservoir release of harmful substances. Erlong mountain reservoir due to the construction of a long time, by the impact of point source pollution, diffused pollution, combined with a large number of soil erosion and water pollution into the reservoir with water, the formation of internal pollution. When the reservoir is the most serious (2004), the water quality is inferior.