Takamizu Sanzan Day-Hiking Guide: Station-to-Station Traverse from Ikusabata to Mitake in Okutama (Tokyo)

For hikers in Tokyo ready to step up from Mt. Takao (599 m) to their first authentic three-peak ridge traverse (juso / 縦走) in the Okutama mountains, Takamizu Sanzan (高水三山, "The Three Peaks of Takamizu") in Ome City is the undisputed gold standard.

Linking Mt. Takamizu (高水山, 759 m), Mt. Iwatakeishi (岩茸石山, 793 m), and Mt. Sogaku (惣岳山, 756 m) in a single chain, this route starts directly from JR Ikusabata Station (軍畑駅) and finishes directly at JR Mitake Station (御嶽駅) on the JR Ome Line—meaning zero bus transfers are required. In early summer and the June rainy season (tsuyu), wild mountain hydrangeas (yama-ajisai) bloom along the damp cedar valleys and mist-wrapped temple precinct of Jofuku-in, while the open summit of Mt. Iwatakeishi rewards hikers with sweeping views over the Okutama and Chichibu peaks.

This guide covers segment-by-segment walking times, highlights of each of the three peaks, how to walk safely over slick limestone rocks and tree roots near Mt. Iwatakeishi and Mt. Sogaku, restroom locations, and Okutama bear-safety precautions.

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Mountain Overview & Basic Data

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Why Takamizu Sanzan Excels Even in Early Summer & the June Rainy Season (Tsuyu)

While high-alpine peaks are often socked in by clouds and gale-force winds during June and early July, Takamizu Sanzan offers four distinct advantages:

1. Direct Station-to-Station Access on the JR Ome Line: You never have to worry about infrequent mountain buses or driving tired; trains run every 30–45 minutes from Mitake Station.
2. Deep Forest Canopy & Mystical Cedar Atmosphere: Roughly 85% of the trail runs beneath tall Japanese cedar (sugi), cypress (hinoki), and deciduous broadleaf canopy, where morning mist around Jofuku-in Temple and the giant cedars of Mt. Sogaku creates an atmospheric mountain-worship setting.
3. Wild Mountain Hydrangeas (Yama-Ajisai) Along the Approach: From mid-June to early July, delicate blue, violet, and white yama-ajisai blossoms line the stream valley along the Hiraiokubo valley road above Ikusabata Station.
4. Well-Maintained Restrooms at the Midpoint (Jofuku-in Temple): Clean public restrooms are available at the plaza of Takamizusan Jofuku-in Temple (~90–100 minutes after leaving Ikusabata Station), a major reassurance for beginners.

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Segment-by-Segment Trail Guide: Ikusabata Station → Three Peaks → Mitake Station

Standard Course Timeline (~3h 50m–4h 15m Walking Time)

JR Ikusabata Station (245 m) → (30–35 min paved valley road) → Takamizusan Trailhead (Checkstone Dam / 砂防ダム) → (60–70 min forest climb) → Jofuku-in Temple & Mt. Takamizu (759 m) → (30–35 min ridge + short steep scramble) → Mt. Iwatakeishi (793 m) → (40–45 min ridge + rocky scramble) → Mt. Sogaku (756 m) → (70–80 min cedar-root descent) → JR Mitake Station (255 m)

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Section 1: JR Ikusabata Station to the Trailhead & Jofuku-in Temple (~90–105 Minutes)

Exit JR Ikusabata Station, use the station restroom, and turn right down the slope toward the Hirai River bridge. Turn left onto the paved valley road passing traditional hillside homes, yuzu orchards, and stream-side patches of wild mountain hydrangeas (yama-ajisai).

About 30–35 minutes from the station, you reach the erosion-control check dam (砂防ダム) and trailhead registration box, where the paved lane ends and the mountain trail begins. The path climbs steadily through cool cedar forest along numbered milestone markers (一丁メ to 十五丁メ), gaining elevation at a consistent gradient until stone steps lead you into the peaceful precinct of Takamizusan Jofuku-in (高水山常福院), an ancient Shingon Buddhist mountain temple guarded by stone wolf (oinu-sama) statues.

Section 2: Peak 1 — Mt. Takamizu (高水山, 759 m) to Peak 2 — Mt. Iwatakeishi (岩茸石山, 793 m) (~35 Minutes)

Climb the short path behind Jofuku-in Temple (~5 minutes) to reach the wooded summit of Peak 1: Mt. Takamizu (759 m).

From Mt. Takamizu, the trail drops briefly into a pleasant deciduous broadleaf saddle before arriving at the base of Mt. Iwatakeishi. The final 10-minute push to the summit is a steep rocky and earthen slope—use short steps and three-point balance (or take the gentler bypass trail on the side if the rocks are slick after rain).

Emerging onto the open summit of Peak 2: Mt. Iwatakeishi (793 m)—the highest and brightest viewpoint of the entire traverse—you are rewarded with a wide panorama north across Mt. Bounore (棒ノ折山), Mt. Kawanori (川苔山), the Okutama and Chichibu mountains, and even the Tokyo Skytree on clear days. With plenty of open space and flat rocks, Mt. Iwatakeishi is the best lunch spot on the route.

Section 3: Peak 3 — Mt. Sogaku (惣岳山, 756 m) & Descent to JR Mitake Station (~110–125 Minutes)

Leaving Mt. Iwatakeishi, descend a steep, rocky path onto the connecting ridge toward Mt. Sogaku. Just before the summit of Mt. Sogaku, the main trail climbs a short, rugged limestone rock scramble (岩場) where chains and tree roots assist your footing:

• Wet-Weather Caution: Limestone and exposed cedar roots become very slippery during or after rain. Stow your trekking poles in your pack before climbing the rock section so both hands are free, or take the signed bypass path (maki-michi) around the rock outcrop if you prefer not to scramble.
• At the top sits Peak 3: Mt. Sogaku (756 m), a solemn, shaded summit enclosed by towering ancient cedars and the fenced shrine of Aokongou Gongen (青渭神社奥宮).

From Mt. Sogaku, the long descent to JR Mitake Station (~70–80 minutes) follows a broad cedar ridge laced with dense networks of exposed tree roots (木の根道), passing the Mahetsuri (真名井 / 慈恩寺) signpost before emerging right across from JR Mitake Station and the Tama River gorge (Mitake Keikoku).

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Footing, Gear & Bear Safety Precautions for Okutama

1. Walking Safely on Wet Tree Roots & Limestone Rocks

On the descent from Mt. Iwatakeishi and from Mt. Sogaku to Mitake Station, never step directly on top of wet, polished cedar roots or slanted limestone slabs—your boot sole can slide sideways instantly. Step squarely onto the flat dirt pockets between roots, keep your center of gravity directly over your front foot, and shorten your stride.

2. Bear Safety in Ome & Okutama

The forests of Ome and Okutama are natural habitat for Asian black bears (tsukinowaguma). Before your hike, check the Ome City Official Bear Sighting Map & Advisories and carry a bear bell (kuma-suzu), especially when hiking on quiet weekdays or early in the morning.

3. Filing a Trail Plan (登山届) with the Tokyo Metropolitan Police

Even on a beginner-friendly Okutama day hike, submit a trail plan in advance via the Tokyo Metropolitan Police Department Online Trail Plan Portal or drop a paper form in the trailhead box at the Ikusabata check dam.

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Access & Post-Hike Refreshments at Mitake Gorge

• Outbound Train Access: From JR Shinjuku Station, take the JR Chuo Line Rapid to Ome Station (青梅駅) and transfer to the JR Ome Line bound for Okutama to Ikusabata Station (軍畑駅) (~85–95 minutes total; direct Holiday Rapid Okutama trains also operate on weekends).
• Return from JR Mitake Station: After finishing at Mitake Station (御嶽駅), you can walk 2 minutes down to the Mitake Gorge (御岳渓谷) riverside walking path, visit the Sawanoi (Ozawa Brewery)清流ガーデン澤乃井園 (one station away at Sawai Station, or a scenic 20-minute riverside walk along the Tama River), or soak in Kabe Onsen / Okutama Onsen on the way back to Tokyo.

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Official References & Trail Information

• Ome City Tourism Association — Takamizu Sanzan Hiking Course Guide
• Ome City Tourism Association — Takamizu Sanzan Spot Overview
• Ome City Official Website — Hiking Course Information
• Ome City Official Website — Bear Sighting Information & Precautions
• Okutama Visitor Center — Latest Trail Condition Updates
• Tokyo Metropolitan Police Department — How to Submit a Mountain Trail Plan (登山届)
• Tokyo Metropolitan Police Department — Ome Police Station Mountain Safety Guide