Mt Otsuka (213m), Machida & Hachioji Cities, Tokyo Prefecture, Thursday, March 20 & 27, 2025

I was looking for an easy hike for the Spring Equinox, since I planned to go hiking again a few days later on the weekend. It had snowed the day before in the mountains around Tokyo so I decided to explore some more parks inside the capital, which I hoped were mostly snow-free. Looking at my map, I noticed that Machida seemed to have a lot of green areas so it felt like a good place to start. I also saw that many trails started and ended at train stations so it seemed relatively easy to make a station to station hike.

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To get to the start of the hike, I’d ride the Chuo line from Shinjuku to Hachioji station, enjoying the comfort of the newly added green (1st class) cars. There, I’d transfer to the JR Yokohama line and ride 3 stops to Aihara station. I’d end at Naganuma station on the Keio line which, after a transfer to the express at Takahatafudo station, I could ride all the way back to Shinjuku. Although Aihara is geographically far from Machida station (13km), it is connected to Machida city via a narrow neck extending westwards.

From the station, I’d head west along Machida-Kaido Avenue to the start of the Nanakuni Pass Promenade (七国峠遊歩道 nanakoku-toge yuhodo), an ancient road that used to run to Tsukui; I’d follow it north past Dainichido Shrine (大日堂 223m), the highest point of the hike, and Nanakuni Pass, where I’d turn eastwards along the north side of Aihara Central Park (相原中央公園). On the way, I hoped to get a view of the Okutama mountains on the west side from the Nanakuni Ridge Viewpoint (七国尾根見晴台).

After crossing Hachioji-kaido Avenue near Goten Pass (御殿峠 206m), I’d continue eastwards along another path, hugging the north side of a university campus; past a bridge over Hachioji bypass, I’d be standing at Yarimizu Pass (鑓水峠), just below the top of Mt Otsuka (大塚山おおつかやま ootsukayama), also the site of Doryado Ruins (道了堂跡), a famous haunted spot. It’s also on the historical Silk road, between Hachioji and Yokohama, which I’d only follow for a short section before turning left. I’d then walk a few minutes down a paved road leading to the Kitanodai residential neighbourhood, and rejoin another hiking trail, on the south side of a small park.

After passing through forest, countryside and farmland in the Nakayama locality, and then crossing the Kaien-kaido Avenue, I’d finally arrive at Naganuma Park (長沼公園), a forested area occupying a steep slope south of Asakawa river, a tributary of Tama river. I’d descend to the park entrance via Tonoyato Path (殿ヶ谷戸の道), and from there it was a short walk through Naganuma Town to get to the train station. The weather was supposed to be cloudy in the morning turning sunny in the afternoon. I was looking forward to doing a rare hike within the city of Tokyo and getting views of the city as well as the surrounding mountains.

In the end, I decided to cut the hike short at Goten Pass, and head north to Katakura Station on the Yokohama line, one stop from Hachioji. The next Thursday, I returned to Aihara station, and after following a shorter route to Goten Pass, picked up where I had left off a week before. I reached Naganuma station around lunchtime, thus completing the planned hike. The one week delay gave me a chance to see the first cherry blossom trees in full bloom of the season.

Donichido Shrine (left) Bell near Goten Pass (right)

See a Slideshow of pictures of the Trail

Snowy Tanzawa mountains near Aihara station

Fallen Tree on the Nanakuni Pass Promenade

Gentle Climbing on the Nanakuni Pass Promenade

Trail on the North Side of the Aihara Central Park

Path heading up Nanakuni Ridge Green Space

View West of Okutama from the Nanakuni Ridge Viewpoint

Trail heading inside Aihara Central Park

Mt Takao (center front), Mt Goten & Mt Odake (right back)

Trail Past the Nanakuni Ridge Viewpoint

Trail Past Goten Pass

Bridge over Hachioji Bypass

View of Western Tokyo from Yarimizu Pass

Looking back at Yarimizu Pass on the Silk Road

Looking down at the Kitanodai Residential Neighbourhood

On the Other Side, Naganuma Park

Back on a Hiking Trail in Nakayama

Beyond the Farmland, the High Rises of Tama Center

View of West Tokyo from the Top of Naganuma Park

Walking along the Tonoyato Path

Early Sakura at Rokushagu Shrine

Watch a Video of the Mt Otsuka Hike

Watch the Video of the Hike on YouTube

See a Slideshow of More Pictures of the Hike

This Blog Post Continues a Little Longer…

I was so taken by Naganuma Park that I decided to return on the third Wednesday of April for some more exploring. This time, I’d ride the Chuo line limited express from Shinjuku to Hachioji, and from there, take the Tama Monorail to Takahatafudo, 3 stops from Naganuma station on the Keio line. I chose this slightly longer way to enjoy the view of Mt Fuji from the right side of the Monorail. For the return, I’d simply ride the Keio line from Naganuma station back to Shinjuku.

A short walk from the station would bring me back to Rokushagu shrine (六社宮). There, I’d follow the West ridge (西尾根) trail to the top of the park (頂上園地 chojo-enchi), then walk a short way to the Naganuma Park Observation Point, an open shelter with a view of West Tokyo and the Okutama mountains. I’d then head down the Tochimoto Ridge (栃木尾根) on the east side of the park. After that, if time allowed, I’d head up the Chosenji Ridge trail (長泉寺尾根), and then, halfway up the park, head down the connecting Western Chosenji Ridge Trail (西長泉寺尾根). After descending once again to the base of the park, I’d make my way back to the nearby Naganuma station.

I was looking forward to getting some more views of western Tokyo, as well as the Tanzawa and Okutama mountains. Blue skies were forecast all day, and in this season, I’d also get to enjoy the new green of Spring, as well as the pleasing melody of birdsong, especially the distinctive call of the Uguisu, the Japanese bush warbler, a sure sign that Spring has arrived.