The 1,310 m (4,298 ft) Mt. Io (pronounced ee-oh) is only slightly higher than the Ebino Plateau and located along Rt. 1 next to Fudo Pond, making it an easy hike to the top. In autumn, its slopes are covered in beautiful tufts of susuki and a few scattered Kyushu azalea bushes. Remnants of this volcano’s abundant sulfur, which used to be mined, are sprinkled across the rocky peak. After a look at the crater area, continue on a longer hike, past scenic fields to Mt. Karakuni, more peaks and more extensive treks (map).