Access Guide

How to Get to Mt. Asama Magma Stone Park

Last updated: April 24, 2024

Also known as Onioshidashi Park, this otherworldly landscape of black, craggy rocks was created from molten lava when Mt. Asama erupted in 1783. Walk among the rocks to see over 100 species of alpine plants and catch views of Mt. Asama, one of Japan's most active volcanoes. Mt. Asama Magma Stone Park is accessible from Tokyo by train and bus.

Recommended Route

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Reach Mt. Asama Magma Stone Park in around 2 hours from Tokyo Station by taking a shinkansen to Karuizawa Station, and then a bus. Alternatively, take a shinkansen to Takasaki Station. From there, transfer to a limited express train to Naganohara-Kusatsuguchi Station, then a local train to Manza-Kazawaguchi Station, followed by a 15-minute bus ride to Mt. Asama Magma Stone Park. The trip takes 2 hours and 30 minutes. A local train from Takasaki to Manza-Kazawaguchi Station is slightly cheaper, but adds an extra 30 minutes to the trip.

Tokyo Station

You can board Hokuriku and Joetsu shinkansen services at Tokyo Station. To reach Karuizawa Station, you need to take the Hokuriku Shinkansen.

Hokuriku Shinkansen

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The Hokuriku Shinkansen from Tokyo Station reaches Karuizawa Station via Takasaki in around 70 minutes. Most seats are reserved. The train fare is covered by various Japan Rail Passes.

Karuizawa Station

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The station offers convenient access to destinations in western Gunma, including Manza, Kusatsu, Tsumagoi, and Naganohara by local buses. Buses for Mt. Asama Magma Stone Park (Onioshidashi-En Bus Stop) depart from the north exit of the station.

Bus to Onioshidashi-En Bus Stop

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Take a Seibu Kanko Bus service bound for Manza Bus Terminal, and get off the bus at the Onioshidashi-En stop. You can pay the fare in cash or with a transportation IC card as you exit the bus. The trip takes around 50 minutes.

Goal: Mt. Asama Magma Stone Park Parking Lot

The parking lot is directly across from the entrance to the park, and is connected by a footbridge. Once you reach the park, there are several restaurants and souvenir shops near the entrance.

Travel Tips

You can use the JR Tokyo Wide Pass, JR East Pass, and other JR passes for trains on this route. However, bus fares must be paid separately. There are many passes and travel combinations to discover, so use the links below to find your ideal travel plan.

JR East Pass
JR Tokyo Wide Pass
Japan Rail Pass
JR East-South Hokkaido Rail Pass

Save time and purchase train tickets and passes, and reserve seats online, before you travel.

Related See & Do


Find a variety of accommodation options near Mt. Asama Magma Stone Park, from luxury private villas with views of Mt. Asama, to traditional ryokan inns and modern onsen resorts at Manza and Kusatsu.

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