Genkai Quasi-National Park, which includes Mt. Tachibana, known for its beautiful coastline and virgin forests of Kusunoki, is also designated as a “Top 88 bathing spots in Japan” by the Ministry of the Environment. Many people come with their families to enjoy the beauty of the sea and the pleasant sea breeze.
The “Akaya no Daimon” which represents this area is one of Japan’s three great Genbudo Cave designated as a natural monument in 1966 and is the largest. From March to December when the waves are calm, you can take a sightseeing boat from Akutaya Fishing Port for about 25 minutes and enjoy the scenery of the deep blue sea and the beehive ceiling in the cave that looks like an art created by nature.
The cave created by wave erosion (scratch) is 64 meters high, 10 meters wide and 90 meters deep. You can only see the mysterious scenery from the sea, which is like opening your mouth to the Genkai-nada Sea, so you should see it from a pleasure boat. The hexagonal and octagonal columnar joints (a columnar fissure in rock formed by natural forces) found in rock walls overwhelm those that create an objet-like shape. You can also see from the boat the (wreckage), a kind of basalt pebble filled with black stones that extend 1000 meters east of the ship and 800 meters west of it “Kuroiso”.
The excursion experience where you can see the natural scenery from the sea is a bit different from the sightseeing around the city.