Uchimaki Cave (内間木洞) Site Visit | Japan’s 5th Longest Cave
内間木洞 Deep in the hundred-acre woods….Oh wait, different story. Let’s start again! Hidden beneath the mountains of northern Iwate lies Uchimaki Cave (内間木洞), Japan’s fifth-longest limestone cave system, stretching more than 6.3 kilometers underground. This is not an ordinary cave. For starters, it is not normally open to the public. It is primarily a research … Read more