Ryusen Cave (龍泉洞) - Dragon Blue Underground Lake Exploration

Visit Ryusen Cave (龍泉洞) in Iwaizumi Town, Iwate, one of Japan's three greatest limestone caverns. Explore the underground lake called "Dragon Blue," renowned worldwide for its remarkable transparency, then visit the Ryusen Shinado Science Museum across the street to learn about traces of the ancient peoples who lived in the cave. Enjoy lunch at Roadside Station Iwaizumi with its specialty Iwaizumi Tanjaku beef and rich Iwai spring yogurt. Spend the afternoon relaxing on the grass at Fureai Land Iwaizumi along the Omoto River. Finish your day at Roadside Station Mitagai Bunko, a repurposed former school, enjoying school-lunch-style snacks and hunting for souvenirs. This one-day journey through an underground world and mountain villages is perfect for groups of friends seeking adventure.