Ryusendo Cave
Ryusendo Cave is one of Japan's three largest limestone caves.
In 1938, it was designated a national park as "Iwaizumi Spring Cave and Bats."
It has been designated a natural monument.
The cave where investigations are still ongoing
Its total length is estimated to be over 5,000m.
The latest survey confirmed that the total length is over 4,088m.
The elevation difference is ±195m.
Approximately 700 meters of the trail is open to the public as a sightseeing course.
A mysterious cavern space stretches out in a straight line from the entrance,
Abundantly crystal clear water
An underground lake that shines "dragon blue"
It is a must-see spot.
Access from Osaka
Underground Lake
The biggest attraction of Ryusendo Cave is its underground lake, which shines a deep blue color known as Dragon Blue. The sightseeing course takes you through the first underground lake, which was discovered during a survey in the 1950s, to the third underground lake, which boasts a maximum depth of 98 meters. The mineral-rich water of Ryusendo Cave, which is nurtured in the surrounding forest area, is used as the water supply for Iwaizumi Town and is also popular as a souvenir.