Highland grasses herding on the lava-based ground. When you get off the rope-way mountain-top station, 2,237 m high, you'll encounter Tsuboniwa natural garden, the art of nature. Back in time, lava that came out of the eruption Yokodake to be hardened and form such ground, making it a natural garden. In cold winter days, tree ice radiating in the sunshine is the art work of nature, creating a illusionary scenes. With guiding placards. If you are to take a walk in the garden, do so with attires or shoes fitted for trekking.