Akiyoshidai is among the largest karst plateaus in Japan, located in Mine City. Throughout the ages, it has gone through many changes, starting as a coral reef, and becoming, over a span of 350,000,000 years, the limestone plateau that it is now. The trees that grew until the middle ages were cut down to grow grass for raising livestock and thatching roofs, resulting in the grassy plains that you can see now.
As a famous tourist spot in Yamaguchi, there are many events that you can enjoy. Every winter, they hold Yamayaki, the burning of the hills, when the grass is burned to maintain its quality. In the summer, you can participate in the Karst Walk, and enjoy walking through the plains, or enjoy the night skies filled with fireworks. In fall the plains are filled with autumn flowers.
Underneath Akiyoshidai, is the Akiyoshido Cave, limestone cave spanning about 9 km. There is a 1 km path that you can walk through the cave. It stay at a constant 17°C, making it feel cool in summer and warm in the winter, a fun visit at any time of the year.