Ryusendo (i.e. Cave of the Dragon Spring) is the an Ancient Cave serving as the site of the Hidden Stone Village's Chunin Exams! Ryūsendō has an accessible length of 10 miles. It has a depth of 250 meters (820 ft!) with a vast array of interwoven tunnels. Visibility is minimal. However unlike the other villages there are very few animals in this test site. Only bats and other cave dwellers. There are several underground lakes hidden into this cavern.