Mt. Kampu: Mt. Kampu is a small volcano with a height of 335 meters. It became active around 20 thousand years ago. Every time an eruption occurred, the lavas of andesite piled up, gradually making the mountain higher and bigger, which created the shape we see now. Here, you can observe the crater and the landform (2) of the lavas that was created when the less sticky lava flowed out.
The Oni-no-Kakurezato (“Hidden village of Demons”) formation (3) was created when the cooling lavas were boosted up from underground to the surface, stretched up like a column, and then collapsed.
There is an air hole where cold wind blows at the bottom of the second crater (1). There are water springs around the mountain and one of them, “Taki-no-Gashira (a head of waterfall),” is a precious water resource for the city of Oga.
Taki-no-Gashira (“The Head of Waterfall”): The area of Mt. Kampu is abundant in spring water and the water sources are located as if to encompass the mountain. According to a survey conducted in 1993, there are 30 water sources in the area. Among them, the Taki-no-Gashira source (4) on the northeast foot has the largest amount of water, 25,000 tons per day. The water is used for waterworks and agriculture and was once saved in a reservoir.
The spring water from the Taki-no-Gashira source is at the tip of the lavas that erupted from Mt. Kampu. Rainfall on Mt. Kampu filters underneath through cracks in the volcanic rock, flows horizontally on the impermeable layer, and flows out from the edge of the lava.
Land Reclamation of Hachirogata: The reclaimed land of the former Hachirogata Lake (now Ogata Village) (5, 6, 7) is the largest area of land ever reclaimed in Japan. Hachirogata Lake used to be the second largest lake in Japan, after Biwa Lake. The new land has an area of 17 square kilometers, 18 kilometers north-south, 12 kilometers east-west. The widespread flat ground is what was once the bottom of the former Hachirogata Lake and is covered by sand and mud.
Sand Dunes: Between the south of Hachiro-gata and the Sea of Japan lie the Tenno dunes (8).
