Embark on an emotional island hike to the unseen Tokyo! "Tokyo 11 Islands Hopping Stamp Rally" held again this year

YAMASTA, a mountain stamp rally app(R) provided by Yamakei Publishers, Inc. (Headquarters: Chiyoda-ku, Tokyo; President: Hirofumi Ninomiya), which handles media business in the mountaineering and nature fields within the Impress Group, has decided to extend the "Tokyo 11 Islands Hopping Stamp Rally" due to its popularity. The event will now run from April 1, 2026 (Wednesday) to March 31, 2027 (Wednesday). The popular prizes awarded for collecting stamps will also be produced in larger quantities, and new registrations for the new season will commence.

※"Mountain Stamp Rally App(R)" is a registered trademark of Yamakei Publishers, Inc.

The "Tokyo 11 Islands Hopping Stamp Rally" takes place on 11 islands scattered across the southern seas of Tokyo. Each island boasts unique nature, culture, and history, offering new discoveries and inspirations with every visit. These islands are accessible from the Tokyo metropolitan area by plane or ferry, with some even suitable for day trips.

Why not embark on an emotional island hike to enjoy the unique natural landscapes, breathtaking views from mountaintops to the sea without obstruction, and distinctive local cultures?

By collecting stamps at check-in points, you will receive a commemorative can badge for the respective island. Furthermore, by visiting multiple islands and earning achievement trophies, you can enter a lottery to win special original pins.

【Event Period】

April 1, 2026 (Wednesday) - March 31, 2027 (Wednesday)

【Stamp Rally Details】

https://yamasta.yamakei.co.jp/info/tokyoshima.html

◆Eligible Islands for Check-in (2 check-in points per island)

There are two check-in points per island. These points are set in places where nature can be felt, locations with excellent views, or historical sites symbolizing the island. Enjoy island hiking and get your stamps!

・Izu Oshima (Mount Mihara, Habu Port)

・Toshima (Minamigayama Park, Azusawake-no-Mikoto Shrine)

・Niijima (Yunohama Open-Air Hot Spring, Ishiyama Observatory)

・Shikinejima (Tomari Beach, Kamibiki Observatory)

・Kozushima (Mount Tenjo, Akasaki Promenade)

・Miyakejima (Maigo Jii (Orojike Park), Volcanic Experience Promenade)

・Mikurajima (Pier (Mikurajima Port), Tori-no-O)

・Hachijojima (Uramigataki Falls, Fureai Farm)

・Aogashima (Otobbu, Geothermal Kiln)

・Ogasawara Islands, Chichijima (Chuo-zan (Observatory), Weather Station Observatory)

・Ogasawara Islands, Hahajima (Chibusa-yama, Samegasaki Observatory)

◆Complete the Stamp Rally and Get Rewards

By collecting two stamps on one island, you will receive one commemorative can badge for that island. These commemorative can badges are specially designed so that when collected and arranged, the illustrations of all 11 islands connect.

Furthermore, by collecting four stamps on two islands and earning an achievement trophy, you can enter a lottery for original pins.

◆What is YAMASTA?

"YAMASTA" is a stamp rally app for mountains and nature, where users press a check-in button within the app at designated locations such as mountain peaks or tourist spots, and a uniquely designed digital stamp is issued for that location. Visiting multiple check-in locations set as part of a stamp rally event provides an incentive to go out, and collecting all stamps offers a sense of accomplishment. Currently, 66 stamp rally events are being held nationwide, with a cumulative total of over 1.12 million visitors.

YAMASTA's check-in function for acquiring stamps utilizes the smartphone's location information system (GPS), allowing it to be used even in offline environments without mobile signal (for calls). Additionally, since the app and server manage the stamp rally events, the implementation period can be freely set. Participants can join the event at their convenience anytime during the period, and there's no need to queue at a counter to get stamps, making it easy for anyone to collect them. In March 2025, in addition to conventional features, a paid subscription service called "Yahoo! Member" was launched, offering enhanced features and support to make mountain climbing and hiking with YAMASTA even more convenient.

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【Yamakei Publishers, Inc.】　https://www.yamakei.co.jp/

Founded in 1930. In addition to publishing businesses related to mountaineering, natural science, outdoor activities, lifestyle, and health, centered around the monthly magazine "Yama to Keikoku," the company also develops online media and services.

Furthermore, it is engaged in solution businesses aimed at regional revitalization in collaboration with companies and local governments, with themes of mountaineering and outdoor activities.

【Impress Group】　https://www.impressholdings.com/

Impress Holdings, Inc. (Headquarters: Chiyoda-ku, Tokyo; Representative Director: Yuki Tsukamoto) is a media group with Impress Holdings, Inc. as its holding company. It develops highly specialized media & services and solution businesses with "IT," "Music," "Design," "Mountaineering/Nature," "Aviation/Railroad," "Mobile Services," and "Academic/Science & Engineering" as its main themes. It also handles the development and operation of content business platforms.

【Contact Information for this Matter】

Yamakei Publishers, Inc. Contact: Noji, Sugiura

Jinbocho Mitsui Building, 1-105 Kanda Jinbocho, Chiyoda-ku, Tokyo 101-0051

TEL 03-6744-1900　 E-mail: info@yamakei.co.jp

https://www.yamakei.co.jp/