Mt. Takahachi Natural Vent Hole

There is a rare phenomenon called a wind hole on the slope of Takahachi Mountain (512m), also known as Ayagami Fuji, which is one of the "Seven Fujis of Sanuki".
Inside the wind hole, the temperature remains cool at around 10℃ to 12℃ even in the middle of summer. It used to be used for storing agricultural products.