Kinone Pass (171m) and Reisui Peak, Minamiboso City, Chiba Prefecture, Sunday, March 20, 2022

I definitely wanted to make one more trip to Chiba this year before the warmer weather arrived. Leafing through my guidebook, I selected a loop hike on the Tokyo bay side of the Boso peninsula. Although it was on the short side, access was straightforward as I could ride the Sasanami limited express there and back. The weather forecast was supposed to be sunny in the morning and cloudy in the afternoon. I was looking forward to getting some good sea views and wondered whether I would get a view of the Mt Fuji on the other side of the bay.

The yellow, red, blue of the beach house roofs

I had my first glimpses of Tokyo Bay from my train seat, ninety minutes after boarding the limited express in Akihabara; it was amazing to think that one of the biggest cities of the world was located on the opposite side. I got off at Iwai station just before 10am, and headed south on a busy road before turning left onto a quiet lane through the countryside. Next, I turned right onto a path parallel to the railway tracks, squeezed between the bay and the hillside. Half an hour later, I reached the entrance of Takasaki park (高崎公園) and continued straight on the slowly rising path.

View of Iwai bay from Takasaki Park

Navigating some course obstacles on the way

I was soon high enough to get a view of the colorful beach house rooftops. I turned left onto a curving log staircase, and at 11am, reached a viewpoint at the top of the park. I could see the dark blue waters of Tokyo and Sagami bays, with the outline of the Miura peninsula beyond; directly below, was Iwai bay, its light blue waters contrasting with the green forested ridge on the north side. As much as I strained my eyes, I could not spot Mt Fuji, normally visible to the northwest according to an illustrative sign board. After a short break, I headed back to the park entrance.

Panoramic view from Reisui peak

Yellow flower fields on the way to the Mt Harada highway

I turned right onto a road leading away from the blue sea and into the hills. I eventually reached the entrance of the hiking path on the left. It was a peaceful trail, through beautiful nature; occasionally I had to duck under a fallen tree, a reminder of the powerful typhoons from 2019. A little after 11h30, I reached Kinone Pass (木ノ根峠 きのねとうげ kinone-touge), its name meaning “tree root”. Despite being a pass, it’s one of the hundred low mountains of Boso; looking back, I had a view of Iwai bay framed by the vegetation. According to my guidebook, I could get a better view a little further east along the ridge.

Exiting the tunnel into a forested valley

These trees were probably knocked down by the 2019 typhoons

The trail was faint, but thanks to pink ribbons attached to branches, I emerged from the trees onto Reisui Peak (冷水ピーク), just before noon, and was rewarded with a panoramic view to the north: as before, I could see the two bays, Miura peninsula and Iwai beach; in the distance, I could now make out the skyscrapers of Yokohama, but Mt Fuji was still hidden; straight ahead, the ragged top of nearby Mt Nokogiri was visible. I sat on a lonely bench to enjoy an early lunch with a view. After, I went down the same way, and followed a road to a tunnel, the start of the “Harada-yama Sawayaka Gaidou” (原田山さわやか街道), built on top of an old highway.

The peaceful Iwabu lake

I was stunned by the sight of a picturesque, forested valley as I emerged from the unlit tunnel. I walked on a road with no traffic and passed through two more dark tunnels (see video). At 2pm, I reached Iwabuko Lake (岩婦湖 iwabuko), at the bottom of a slope lined with cherry blossom trees, their buds still firmly closed. The quiet of the lake was punctuated by birdsong coming from the trees on the opposite shore; a fisherman drifted across the lake on an inflatable floating device. I found a rocky spot near the water and enjoyed the rest of my lunch. From the lake it was another 30 minutes back to the station, where I caught the limited express for the 2 hour ride back to Tokyo.

See the views of Iwai bay, walk the dark tunnels of Mt Harada and listen to the birds of Iwabu lake

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