This is an admission ticket to Ryusendo Cave in Iwaizumi Town, Iwate Prefecture, designated as a national natural monument and recognized as one of Japan's top three limestone caves. Visitors can explore 700 meters of the currently open passages out of a total known length of 4,088 meters. Experience artistic stalactites formed over endless time and world-class transparent "Dragon Blue" subterranean lakes up close. Discover this mysterious underground world with a year-round temperature of around 10°C.
World-Class Transparency "Dragon Blue" Subterranean Lakes: A must-see deep, vibrant blue underground lake boasting some of the clearest water in the world.
National Natural Monument & Historic Cave: One of Japan's top three limestone caves and a precious natural heritage site, designated alongside its resident bats.
Comfortable Climate Year-Round: The interior maintains a constant temperature of around 10°C, offering a cool escape in summer and a comfortable environment in winter.
Story & Highlights: Ryusendo is a mystical limestone cave sculpted by water over an eternity. Of the 4,088 meters of currently known passages (with research still ongoing), approximately 700 meters are open to the public. Highlights include the brilliant blue underground lakes (First, Second, and Third lakes) boasting world-class transparency, and various stalactites shaped by natural artistry.
Standard Itinerary (Estimated Duration: approx. 30–40 minutes):
Enter the cave from the reception/entrance gate.
Follow the maintained walking path to observe various stalactites and the underground lakes (1st, 2nd, and 3rd lakes).
Reach the turning point and head toward the exit (after the tour, visitors can also stroll around the surrounding park area and Mineral House).
Some paths and stairs inside the cave may be wet and slippery; comfortable walking shoes are recommended.
Pets are not allowed inside the cave.
Jacket and raincoat rentals are not available (since the cave temperature is around 10°C year-round, bringing a light jacket or sweater is recommended even in summer).
The cave may be temporarily closed without prior notice due to high water levels or other conditions.