What company is organizing the Oizumi Ryokuchi Kaba-kun Stamp Rally and what is its headquarters location?

Yama-kei Publishers Co., Ltd. is organizing the event, and its headquarters is located in Chiyoda-ku, Tokyo.

When does the Oizumi Ryokuchi Kaba-kun Stamp Rally begin and what is the starting day of the week?

The stamp rally begins on Saturday, April 11, 2026, which is the starting day of the weekend.

What is the name of the app used for the Oizumi Ryokuchi Kaba-kun Stamp Rally and who owns it?

The app used is called 'YAMASTA', which is the mountain stamp rally app owned by Yama-kei Publishers Co., Ltd.

What natural feature is depicted when participants complete the full walking route of the stamp rally?

When participants walk the entire route, their GPS tracks form the shape of 'Kaba-kun', a hippo, on the map.

How many trees are planted in Oizumi Ryokuchi and which cities in Osaka Prefecture does the park span?

Oizumi Ryokuchi has about 320,000 trees and spans Sakai City and Matsubara City in Osaka Prefecture.

Collect Stamps and Draw a Hippo! Drawing Hike Stamp Rally at Oizumi Ryokuchi, Osaka

Published Apr 10, 2026 8:00 PM ・ Updated Jun 17, 2026 3:17 AM ・ 4 min read ・ Source: PR TIMES

Yama-kei Publishers' app 'YAMASTA' will host a GPS art stamp rally at Oizumi Ryokuchi in Osaka starting April 11, 2026. Participants can enjoy walking through nature while their GPS trail draws a hippo ('Kaba-kun') on the map.

Yama-kei Publishers Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President: Hirofumi Ninomiya), which handles media business in the mountain and nature fields under the Impress Group, will hold the drawing hike 'Oizumi Ryokuchi Kaba-kun Stamp Rally' starting Saturday, April 11, 2026, using its mountain stamp rally app(R) 'YAMASTA'.

* 'Mountain Stamp Rally App(R)' is a registered trademark of Yama-kei Publishers.

◆ One of Osaka's 4 Great Green Spaces: Oizumi Ryokuchi Spanning Sakai City and Matsubara City in Osaka Prefecture, Oizumi Ryokuchi is a vast forest park planted with about 320,000 trees. Including the 'Kakitsubata Garden' where you can enjoy about 10,000 plants of 15 varieties, seasonal flowers such as cherry blossoms and hydrangeas color the park, making it a beloved recreational area for local residents to easily feel nature.

◆ What is the 'Oizumi Ryokuchi Kaba-kun Stamp Rally' The 'Oizumi Ryokuchi Kaba-kun Stamp Rally' is GPS art where you draw a picture with your walking tracks while visiting check-in points within Oizumi Ryokuchi. When you walk the entire route, 'Kaba-kun' (a hippo) appears on your trail.

The stamps you can collect at each check-in point feature Kaba-kun traveling through the streets of Sakai. In addition to completing the stamp rally to finish Kaba-kun, pay attention to the places Kaba-kun visited in Sakai.

If you complete the stamp rally and apply, you will receive a certificate of completion. For more details, please check the special page on the YAMASTA website.

【Implementation Period】 From Saturday, April 11, 2026, until the end of the stamp rally

【Campaign Details】 https://yamasta.yamakei.co.jp/info/oekakihike_oizumikaba.html

◆ What is 'GPS Art' 'GPS Art' is an activity where you use a GPS-enabled device, such as a smartphone, to draw pictures or letters on a map with the tracks you walked. There are various styles, including walking, running, and cycling, and it is enjoyed worldwide as a 'non-competitive sport.'

◆ Course and Check-in Points

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Source: PR TIMES
Category: Event

Collect Stamps and Draw a Hippo! Drawing Hike Stamp Rally at Oizumi Ryokuchi, Osaka

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