Mt. Seihachiyama (せいはちやま, 1,593m) on the Otsuki / Tsuru / Fuefuki City border, Yamanashi, is the 12th-rank peak of the Shurei Fugaku Twelve Views (paired with Mt. Honjagamaru). Located on the Misaka ridge north of the Mitsutoge system, the summit offers a 360° panorama of Mt. Fuji, Mt. Mitsutoge, the Southern Alps, the Yatsugatake range, and the Daibosatsu Range.
Paired with Mt. Honjagamaru, the standard route covers both peaks. Intermediate ★★★★・distance ~12 km・elevation gain 980 m・action time ~7 hours. Options are the Sasago Stn → Seihachi Pass → Mt. Seihachiyama → Mt. Honjagamaru → Sasago Stn circuit, or the Mitsutoge traverse (~10 hr long route).
Access to the trailhead
- [Outbound / Return] Otsuki Stn ⇔ Sasago Stn / Mitsutoge Stn (JR Chuo Line local / Fujikyu Railway)
- Sasago course, Honjagamaru traverse, suggested plans
Course time (Sasago → Mt. Seihachiyama → Mt. Honjagamaru circuit, day hike, Intermediate, ~7 hours)
Sasago Stn (610 m) → (0:30) → Sasago-Nishi trailhead → (3:00) → Seihachi Pass → (0:20) → Mt. Seihachiyama (1,593 m) → (0:40) → Mt. Honjagamaru (1,631 m) → descent (2:30) → Sasago Stn
(Traverse) Sasago → Mitsutoge Stn traverse (Expert, ~10 hr): Sasago Stn → Mt. Seihachiyama → Mt. Honjagamaru → Mt. Ohata → Mt. Mitsutoge (1,785 m) → Mitsutoge Stn
1. [Outbound / Return] Otsuki Stn ⇔ Sasago Stn / Mitsutoge Stn (JR Chuo Line local / Fujikyu Railway)
Sasago Station (610 m, JR Chuo Line local-only) is the trailhead base; Mitsutoge Station (Fujikyu Railway) is the traverse descent station. Otsuki → Sasago ~8 min・¥240 (JR Chuo Line local), Otsuki → Mitsutoge ~25 min・¥640 (Fujikyu Railway); service approx. every 30-60 min. Private car: roadside parking near Sasago Station (few spaces). Limited Express Kaiji / Azusa bypass Sasago Station — transfer to local at Otsuki required.
Operating period : Year-round, JR Chuo Line local / Fujikyu Railway
Travel time : Otsuki Stn → Sasago ~8 min・Mitsutoge ~25 min
Fare : Sasago ¥240, Mitsutoge ¥640
Frequency : approx. every 30-60 min
Otsuki Stn → Sasago Stn (JR Chuo Line local, morning hiker excerpt)
| Otsuki Stn dep | Sasago Stn arr |
|---|---|
| 5:55 (early) | 6:03 |
| 6:35 | 6:43 |
| 7:25 | 7:33 |
| 8:18 | 8:26 |
Sasago Stn / Mitsutoge Stn → Otsuki Stn (return, JR Chuo Line local / Fujikyu Railway)
| Descent Stn dep | Line | Otsuki Stn arr |
|---|---|---|
| Sasago 14:55 | JR Chuo Line | 15:03 |
| Mitsutoge 14:35 | Fujikyu Railway | 15:00 |
| Sasago 16:55 | JR Chuo Line | 17:03 |
| Mitsutoge 16:35 | Fujikyu Railway | 17:00 |
Note : JR Chuo Line local and Fujikyu Railway timetables should always be pre-confirmed at the JR East / Fujikyu Railway official sites. Limited Express Kaiji / Azusa bypass Sasago Station. After descent, “Tenku-no-Yu” near Otsuki Station or Mitsutoge area onsens (when doing traverse) are recommended.
Reference : JR East Chuo Line timetable ｜ Fujikyu Railway official
Contact : JR Otsuki Station ☎0554-22-0029 / Fujikyu Railway ☎0555-22-7133
2. Sasago course, Honjagamaru traverse, suggested plans
About Mt. Seihachiyama
The Shurei Fugaku Twelve Views are mountains chosen by Otsuki City for their outstanding views of Mt. Fuji, with 20 summits spread across numbers 1 to 12. Mt. Seihachiyama, paired with the neighbouring Mt. Honjagamaru, is counted as the 12th-rank peak, and since the two summits lie only about 40 minutes apart on foot, climbing them as a set is the classic approach. It stands at the northern end of the ridge running from the Misaka Mountains toward Mt. Mitsutoge and also serves as a starting point for the traverse to Mt. Mitsutoge. The stretch over to Mt. Honjagamaru is a rocky, mixed ridge walk.
Trail overview (2 main courses)
- Sasago → Mt. Seihachiyama → Mt. Honjagamaru out-and-back (standard, Intermediate, ~7 hr): Sasago Stn → Sasago-Nishi trailhead → Seihachi Pass → Mt. Seihachiyama → Mt. Honjagamaru → Sasago Stn; complete 12th-rank peak conquest
- Sasago → Mitsutoge traverse (Expert, ~10 hr): Sasago Stn → Mt. Seihachiyama → Mt. Honjagamaru → Mt. Ohata → Mt. Mitsutoge → Mitsutoge Stn; long traverse
Mountain huts / hot springs (2026 information)
– No huts on the trail: Day-hike basis
– Roadside parking near Sasago Station: Few spaces
– “Tenku-no-Yu” near Otsuki Station: Drop-in bath
– Mitsutoge area onsens (traverse descent): Kawaguchiko Onsen, Nishikatsura Town onsens
Climbing season / flora: May to November. May-June: mitsuba-tsutsuji, fresh greens; October-November: autumn colors. Winter (Dec-Feb) has snow / ice; light crampons / poles recommended.
Cautions
– Local / Fujikyu Railway transfer required at Otsuki: Limited Express bypasses Sasago
– Steep climb from Seihachi Pass: Intermediate level, for fit hikers
– Mitsutoge traverse is 10+ hours: Very fit hikers only, early start required
– Water only at trailhead stream: Carry at least 1.5 L
– Winter ice caution: Light crampons recommended
Emergency contacts / inquiries
- Otsuki City Office (Tourism Association): ☎0554-22-2942 / Tsuru City Office: ☎0554-43-1111 / Fuefuki City Office: ☎055-262-1111
- Otsuki Police (climbing notification / mountain rescue): ☎0554-22-0110
- JR Otsuki Station: ☎0554-22-0029 / Fujikyu Railway: ☎0555-22-7133
Suggested plans (Sasago → Mt. Seihachiyama → Mt. Honjagamaru out-and-back, day hike, recommended, standard)
- Day-hike out-and-back (recommended, Intermediate): Shinjuku 6:14 → Otsuki Stn 7:50 → Sasago Stn 7:58 → Sasago-Nishi trailhead 8:30 → Seihachi Pass 11:00 → Mt. Seihachiyama 11:20 (Mt. Fuji panorama) → Mt. Honjagamaru 12:00 → Sasago Stn 14:55 → Otsuki Stn 15:03 → return
- Mitsutoge traverse (Expert, very fit): Sasago Stn 6:00 → Mt. Seihachiyama → Mt. Honjagamaru → Mt. Mitsutoge → Mitsutoge Stn 16:00 (~10 hr)
Reference : Mt. Seihachiyama – Mt. Honjagamaru detailed guide ｜ Otsuki Tourism Association
Photo by Alpsdake
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