The original Yahekou Reservoir was renamed Dunan Lake. In order to better publicize the tourism resources and culture of Yahekou, Yahekou Reservoir was officially renamed Dunan Lake on June 3, 20 12 with the approval of Nanyang Yahekou Industrial Zone Management Committee and Yahekou Reservoir Engineering Management Bureau. To the north of Dunan Lake are the towering Taizi Mountain and Jiuli Mountain. Dunan Lake in the north of the work area has an open water surface and has become an important water ecological resource in the north of the work area. At the same time, Dunan Lake has good water quality and excellent ecological environment, which is suitable for living and management.

Lianhua Hot Spring Watertown is located in the east of Yahe Industrial Zone, the "North Wing" new area in Nanyang City, Henan Province, adjacent to Yahe Dam, covering an area of 1.200 mu. Its main development projects include Baihe Watertown, island villa, dynamic health spa, business hotel, five-star hotel, exhibition center, health food, international club, high-grade business residence, traditional Chinese medicine health care and so on. It is the first ecological hot spring in the Central Plains built by Henan Wanjiayuan Group.