剣山, Tsurugi-san, also known locally as Ken-zan, sometimes spelled 'Turugi'
(1955 m) It is Iya's most popular hiking destination and the 2nd tallest in Shikoku (#1 being Mount Ishizuchi). One of Japan's "100 Most Famous Mountains", the name may mean "Sword Mountain", but this is a singularly inaccurate description of this gently rounded fell, and you can even take a chairlift up most of the way (¥1000). From the chairlift terminal, it's a half-hour climb to the summit. Alternatively, if you choose to hike up or down the long way (2 hours or so), you can stop at Otsurugi Shrine (お剣神社) along the way for a free sip of holy sake and a quaff at a clear mountain spring with drinkable water. On July 15–17 every year a special shrine festival takes place, culminating on the 17th when processions clad in white robes head to the summit. There is a staffed mountain hut with meals and accommodation on the summit, and camping is available near the upper chair lift station. The main access trail-head starts in Mi-no-Koshi.
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For considerably more atmosphere and far fewer crowds (if any at all), the Oku-Iya Niju Kazurabashi (奥祖谷二重かずら橋 Deep Iya Double Vine Bridge) can be found at the eastern end of the valley, before the final ascent to Mi-no-Koshi.
三嶺
Another popular trip, but less crowded and maybe prettier than Mt. Tsurugi. At 1893 m, locals say it is the best hike to see the autumn foliage, but it's nice any season. The main trail starts at the hamlet of Nagoro (follow signs) with lower and upper parking areas (the upper area follows the crumbling road about 1.5 km, not recommended if you love your car) and takes about 2½ hours up. Miune can also be accessed in a very long day hike from Tsurugi-san along the ridge line (see above), or to/from the Iyashi-no-Onsenkyo hotel in a rough 3½- to 4½-hour climb. It can also be accessed to/from Mt. Tenguzuka in the opposite direction of Mt. Tsurugi. At the top of Miune is a large emergency hut which can also be used for overnight staying free of charge (bring your own sleeping and eating equipment, and seal up food due to hungry mice). There is a spring for replenishing your drinking water near the summit, but it can be easy to miss. It is along the Nagoro trail right below the summit, look for a small wooden sign with a kanji for water on it (水) pointing to a small path branching off the trail.
矢筈山
On the other side of the valley, Mt. Yahazu peak can be accessed from Ochiai-toge 落合峠 (Ochiai mountain pass). The summit is about a 2- to 2½-hour hike from the parking area near the pass top (if going up from Ochiai, the path would be on the right). This is fairly steep, but the panoramic views from the peak top are fantastic as this is the highest point on the northern side of the valley (1848 m). You'll most likely see few if any people. It is also possible to only hike the first ten minutes or so towards Mt. Yahazu to the first overlook if one wants a much better view than what is offered from the pass. There is no bus to Ochiai-toge, so you need a car or a lucky thumb (see the "Ochiai Pass" listing under See).
天狗塚
This tall, pyramid shaped mountain peak has fine 360° views from its 1812-m pointed top. Along the ridge below the peak itself, a broad expanse of sasa (short bamboo grass) fields curve gently over the mountain top, allowing for a fairly flat long walk around the area (eventually the path here just goes down the other side of the mountain). A very nice mountain hut is nearby in the opposite direction of the sasa grass fields. This is a fine hike and peak, and you will see relatively few people compared to Tsurugi or Miune. To access, it is about 2½ hours from Miune along the ridge, or 3½ to 4 hours from the Kubo trail head (From the Kubo public bus stop, cross the bridge, follow the road up for 10 minutes by foot or 1 minute by car. Bear left at the first turn off to go over the small bridge, and access the path soon after that on the right at crumbling sign). If driving, there is also a higher access road above Kubo (saving about 1 to 1½ hours of uphill hiking) that can be reached via the small road a few minutes past the Ochiai area on Rt 439 (turn to the right at the brown sign for "Tenguzuka" in English) and follow about 8 km, or get there the other way by going through the Iyashi-no-Onsenkyo Hotel parking lot (about 7 km after the hotel). If coming up this trail (either from Kubo or the access road), once at the top of the ridge, the peak will be clearly visible to the right, with the sasa fields just beyond, and the hut is 20 minutes down and around the ridge to the left towards Miune.
なこち
It's about three or four minutes up the path from San-jo Jinja (to the right/northeast) or from the road just above. Nakochi is a cafe and event space situated in a restored traditional farmhouse. Usually only open on weekends and national holidays, it's a good place to take a break and enjoy a meal or cup of tea while exploring Ochiai hamlet. The house has nice views through the valley and is arranged with antiques and a traditional floor hearth. Various events are also held throughout the year here (potato harvesting, tea ceremony, art exhibition). Other activities can be arranged by request and include soba making, yoga, sausage making, guided Ochiai tours, star-viewing, and mountain hike guides. See Eat for more details about the cafe.
長岡家
It is a thatched roof farmhouse and one of the oldest still standing structures in Ochiai. A culturally protected building, it has been cleaned up nicely for visitors to walk through and see the interior. With its floor hearths, paper doors, and antique chests, it's a nice place to relax and view the valley. Local information is available here. It is in the center of Ochiai along the hamlet road, about 150 meters below the San-jo Shrine.