[Image1]Autumn 2025 Mt. Io Light-Up & Kawayu MarcheIn 2025, the autumn event returns to Kawayu Onsen.From Sa
[Image2]Autumn 2025 Mt. Io Light-Up & Kawayu MarcheIn 2025, the autumn event returns to Kawayu Onsen.From Sa

Autumn 2025 Mt. Io Light-Up & Kawayu Marche
In 2025, the autumn event returns to Kawayu Onsen.
From Saturday, October 4 to Saturday, November 29, the Atosanupuri (Mt. Io) Light-Up will run, and on Saturday, October 18 the Kawayu Marche—featuring many local vendors—and the Onsen River Night Walk Tour, a nighttime walk along the hot-spring river, are scheduled.
Please take this chance to visit Kawayu Onsen in autumn.



Atosanupuri (Mt. Io) Light-Up
This popular autumn event lights the plumes rising from the mountainside, creating a magical nocturnal landscape.

● Period: 20 days in total, mainly on weekends, between October 4 (Sat) and November 29 (Sat)
● Time: 16:30–19:00
(On event days, the Sulfur Mountain MOKMOK Base will extend business hours until 18:00)
● Free to view
● On some days, a complimentary shuttle taxi will run from four lodging facilities in the Kawayu Onsen area!
(Seats for 9 people / reservation required by 16:00 on the day / limited to operating days)

*Please check the event calendar for the exact light-up dates and shuttle taxi operation days and times.*
*This event is conducted with environmental consideration; dates and times are set in advance and environmental surveys are carried out.*



Kawayu Marche
A gathering of delicious local foods!
Stalls line the hot-spring town, and the lively Kawayu-bayashi drumming will be performed.
● Date and time: Saturday, October 18, 12:00–19:00
Postponed to the following day in case of severe weather
● Location: Kawayu Onsen (next to KKR Kawayu)



Onsen River Night Walk Tour
The hot-spring river that flows through the town, the Onsen River, rises in steam and carries warm spring water—a miraculous scene. Join a guided night walk along the river to hear explanations and discover its mysteries. The tour covers a short distance at a leisurely pace, so anyone can join.

● Date and time: Saturday, October 18, 17:00–17:45
● Meeting: 16:45 at the parking lot of Kinki-yu Bettei Suikazura ryokan
● Reservation required by the day before at 070-8985-2599
● Capacity: 15 people
● Free participation

https://www.masyuko.or.jp/news/2025_kawayu_autumn/...

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2025秋 硫黄山ライトアップ&川湯マルシェ | お知らせ | 弟子屈なび
2025年、今年も川湯温泉で秋のイベントが開催されます。 10/4(土)~11/29(土)は「アトサヌプリ(硫黄山)ライトアップ」、 10/18(土)には、地元のお店もたくさん出店する「川湯マルシェ」と、温泉川を歩く夜の体験「温泉川ナイトウォークツアー」が予定されています。 ぜひこの機会に、秋の川湯温泉にお越しくださいね。

Mount Iō

Mount Iō, Kawayu, Teshikaga, Kawakami District, Hokkaido 088-3461, Japan
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Sep. 29, 2025
Nature Contact Lecture Series at Kawayu Visitor Center Kawayu Visitor Center will host two lectures in the Nature Contact series. In October, Tomoko Yoshikawa, Professor Emerita of the Faculty of Agriculture at Tamagawa University, will present “Life in Volcanic Lakes: Ecological Connections of Lake Kussharo.” In December, Mitsuhiro Nakagawa, Researcher and Specially Appointed Professor in the Faculty of Science at Hokkaido University, will give a talk titled “Why Is Lake Kussharo So Shallow? The Secrets of Atosanupuri Volcano Revealed by Recent Research.” Our region spreads around the Kussharo Caldera, shaped by major volcanic activity. Lake Kussharo, Japan’s largest caldera lake, stands as a symbol of Akan-Mashu National Park and has nurtured a wide variety of life thanks to volcanic bounty. To take a fresh look at this special lake and share its appeal and origins, we planned these two lectures. First, an exploration of the lake’s connections with its living creatures; second, a clear explanation of volcanic findings uncovered by recent research, delivered gently by each expert. We hope that encountering the grand natural story behind the familiar landscape of Lake Kussharo will give you a deeper understanding of and pride in the lake and the park. “Life in Volcanic Lakes: Ecological Connections of Lake Kussharo” Tomoko Yoshikawa, Professor Emerita, Faculty of Agriculture, Tamagawa University, will appear as speaker. Date: Saturday, October 25 — 1:30 PM to 3:30 PM Venue: Kawayu Visitor Center, second floor Admission: Free (no registration required; capacity 50) “Why Is Lake Kussharo So Shallow? The Secrets of Atosanupuri Volcano Revealed by Recent Research” Mitsuhiro Nakagawa, Researcher and Specially Appointed Professor, Faculty of Science, Hokkaido University, will be our guest speaker. Date: Saturday, December 6 — 1:30 PM to 3:30 PM Venue: Kawayu Visitor Center, second floor Admission: Free (no registration required; capacity 50) Kawayu Visitor Center Nature Contact Lecture Series Venue: Kawayu Visitor Center, second floor Inquiries: 015-483-4100 / 9:00 AM–4:00 PM / Closed Wednesdays Organizer: Lake Kussharo Caldera Nature Contact Promotion Council https://www.masyuko.or.jp/news/kawayuvcfureai2/