Hagi no Myojin Pond is a rare pond located on the slope of Mt. Kasayama in Hagi City, Yamaguchi Prefecture. Because seawater springs up from underground here, a rare phenomenon can be seen in the world where sea fish and freshwater fish live together. The water is very clear, and you can observe the state of the seabed and the fish swimming. In particular, the sight of sea fish such as black porgy and black porgy swimming together with freshwater fish gives a sense of the mysteries of nature. There are promenades around the pond, making it ideal for observing the unique ecosystem while taking a quiet stroll.

Further back from Myojin Pond is Mt. Kasayama, which is said to be the smallest volcano in Japan. From the observation deck at the top of the mountain, you can see a 360-degree panorama of the Sea of ​​Japan, the coastline of Hagi, and the beauty of the many islands in the distance. Especially at dusk, the magnificent view of the sun setting over the Sea of ​​Japan spreads out, and many tourists visit to see the magnificent view. The road to the observation deck is relatively well maintained and can be accessed by car, but you can also walk along the promenade in part to feel the nature.