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Nong Han Lake in Sakon Nakhon Province is the largest freshwater lake in the Northeast, covering an area of ​​over 77,000 rai. This waterway has long served as a vital artery, sustaining the people of Sakon Nakhon Province. The story of people and Nong Han Lake is told through ancient folk tales, between humans and the Naga, a demigod creature endowed with immense strength and influence. There are also love stories between the Khmer princess Nang Ai and Thao Pha Daeng. These stories tell the story of the settlement and the way of life of the people who have relied on this lake since ancient times. However, when we consider the cultural context, the evolution of Nong Han Lake has not always been in line with the prosperity of the current metropolis. In the past, the water in Nong Han Lake was crystal clear and abundant with a variety of aquatic life. However, after the construction of water gates to control water for consumption and agriculture, while the construction of the water gates at Nong Han Lake has had positive effects, it has also led to changes in the Nong Han ecosystem. Natural fish from the Mekong River that used to flow down the Kam River have disappeared, and the water has become polluted and weedy. and expanded rapidly in Nong Harn