The greatest attraction of the Kawazu Nanadaru Geosite is the magnificent view of seven waterfalls in the Kawazu River gorge. Around 25,000 years ago, a lava flow from the Noborio Minami Volcano blocked a section of the gorge. Water later flowed over the lava and created the cascades, water has also cut the lava to expose exquisite columnar jointing in places. Columnar joints are visible on the base rock of the Saruta Fuchi area located to the upstream.
This waterfall is a truly overwhelming sight with the lava that one day gushed from Noborio-Minami Volcano hanging over it. Some lava rocks are shaped like columns. These are called "columnar joints" as they were formed by lava contracting as it cooled down, making them shaped like columns. Columnar joints grow in the directions, from which lava cools down (which are usually the upper part that is exposed to the air and the lower part that is in contact with the ground).