triangle longwan Nature Reserve is located in the southeast of huinan county, Tonghua City, Jilin Province, and belongs to the Longgang Mountains of Changbai Mountain. The reserve consists of triangle longwan, Dalongwan, Erlongwan, Xiaolongwan and Sifangding, which are the top ten scenic areas of "seven bays, one lake and two roofs".

triangle longwan has a water surface area of 51 hectares, the maximum water depth in the lake is 114 meters, and the water storage capacity reaches 11 million cubic meters. Because the water surface is triangular, and there is a 31-meter-high triangular stone standing on the Hunan side, it is named "triangle longwan".

Introduction to Tonghua City:

Tonghua, a prefecture-level city under the jurisdiction of Jilin Province, is located in the southeast of Jilin Province, bordering Baishan in the east, Benxi, Fushun and Dandong in the west, facing Cijiang Road of the Democratic People's Republic of Korea across the Yalu River in the south, and connecting Liaoyuan and Jilin City in the north. By August, 2122, the city has 2 districts, 3 counties and 1 county-level cities, with a total area of 5611 square kilometers.

Tonghua has a long history and profound cultural heritage. It is the birthplace of Koguryo culture and Shaman culture. Koguryo established its capital in Ji 'an for 425 years, and Koguryo's royal city, tombs and noble tombs are the only world cultural heritage in Northeast China that has been successfully declared independently.

the above contents refer to: Baidu Encyclopedia-triangle longwan and Baidu Encyclopedia-Tonghua.