The landscape is formed by the Nakadake crater's geological history, resulting in a unique bowl-shaped caldera floor.
The two ponds in the center of the plain are ephemeral and often fluctuate in size depending on the level of seasonal precipitation.
Kusasenrigahama is part of the Aso Geopark, which is recognized by UNESCO for its rare volcanic landforms.
The plain is used as a pasture for local cattle and horses, which often roam freely in the designated zones.
The soil composition is primarily volcanic ash, which creates a distinct contrast against the bright green grasses of summer.
The site has been used for centuries as a grazing ground, maintaining the open grassland state through controlled livestock activity.
Kusasenrigahama is a vast, 785-meter-wide grassy plain located within the Aso-Kuju National Park, situated inside the caldera of Mount Aso. The site features two central ponds formed by rainwater accumulation in the depression of a dormant crater. It offers direct views of Mount Nakadake, one of the most active volcanoes in Japan. The terrain is a plateau characterized by low-lying volcanic vegetation and grazing horses or cattle. Visitors walk on designated gravel and dirt paths that encircle the central meadow. The location serves as a primary hub for hikers preparing to traverse the surrounding Aso volcanic peaks. Weather conditions are highly volatile, frequently shifting between clear skies and dense mountain fog.
The raised wooden walkway on the northern edge, providing a panoramic view of both ponds and the Mount Nakadake crater rim.
Bring a windproof jacket even in summer, as the elevated location causes rapid temperature drops and high winds.
Wear closed-toe footwear with good traction, as the volcanic paths can become muddy and slippery after rainfall.
Carry a physical map or use offline GPS, as thick mountain fog can reduce visibility to only a few meters in minutes.
Attempting to walk to the crater edge from the plain without proper hiking gear or during high volcanic gas warning levels.
Access may be restricted during periods of high volcanic activity or severe winter snowstorms.
Do not feed or approach the grazing horses and cattle; stay on marked paths to protect the volcanic flora.
