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Lake Mashu and its caldera walls seen from an observation point

Hokkaido, Japan

Lake MashuMASHU

A lake with no river flowing in, and none flowing out.

43°35'N 144°31'E

01IntroductionIntroduction

A lake with no river flowing in, and none flowing out.

Teshikaga Town, Hokkaido. A lake enclosed by steep caldera walls, with no rivers flowing in or out. Known for its deep blue surface, Kamuishu Island floating in the lake, and frequent fog.

Caldera lakeMashu blueKamuishu IslandLake of fog

02Key InformationKey information

Key information about Lake Mashu

Only information confirmed in the sources (listed at the bottom of the page) is shown. Please check the latest official information before your visit.

PrefecturePrefecture
Hokkaido
RegionRegion
Hokkaido
MunicipalityMunicipality
Teshikaga Town
ElevationElevation
Lake surface elevation 351 m
Protected areasProtection
  • Akan-Mashu National Park
AreaData
19.22 km²
Maximum depthData
211.5 m
LocationCoordinates
43°35'N 144°31'E
Mount Kamuinupuri and the deep blue Lake Mashu

Lake Mashu — Hokkaido

Photo: Original uploader (WT-fr) Newton4ever at French Wikivoyage / Wikimedia Commons / Public domain

03StoryStory

The Story of
Lake Mashu

Stand at an observation point on the outer rim, and a steep cliff drops from your feet to a deep blue lake below. No river flows into Lake Mashu, and none flows out.

In the centre of the lake floats a small island called Kamuishu. In summer, fog often covers the lake, and whether it clears to reveal the water is a matter of the day's luck.

In winter, when the outer rim is covered in snow, the blue of the lake looks deeper still.

04GalleryGallery

4 photographs

—FilmTravel through film

Lake Mashu on film

All films →

人生で一度は見てほしい絶景。結氷前の摩周湖<#弟子屈町公式ニュース>

Source: 弟子屈町公式チャンネル / Watch on YouTube ↗

[4K][声と旅する国立公園] 阿寒摩周 | 日本の国立公園

Source: 環境省 日本の国立公園 / Watch on YouTube ↗

The films shown here are published on YouTube by official channels such as the Ministry of the Environment, local governments and tourism associations, and are presented using YouTube's embed feature. Copyright remains with each publisher. No connection is made to YouTube until you press play.

05SeasonsThrough the seasons

The four seasons of Lake Mashu

  1. SpringSpring

    The outer rim with lingering snow, and slopes slowly turning green again.

  2. SummerSummer

    The foggy season. The water revealed through a break in the fog is mysterious.

    Recommended

  3. AutumnAutumn

    Autumn leaves on the outer rim, and a deep blue in the clear air.

    Recommended

  4. WinterWinter

    The snow-covered outer rim and the blue lake. A vivid contrast found only in winter.

    Recommended

06LocationLocation

43°35'N 144°31'E

Hokkaido, Teshikaga Town (Hokkaido)

An interactive map is in preparation. For now, the location is shown among all destinations.

26°N30°N34°N38°N42°NMASHU

07NearbyNearby scenic spots

Another landscape, close by.

Mount Oakan and a sightseeing boat crossing Lake Akan

Lake Akan

AKAN

About 37 km (straight-line distance)

The Shiretoko range reflected in the first of the Shiretoko Five Lakes

Shiretoko

SHIRETOKO

About 75 km (straight-line distance)

The vivid blue Shirogane Blue Pond lined with standing dead trees

Biei

BIEI

About 165 km (straight-line distance)

10Photo CreditsPhoto credits

PhotoTitle / PhotographerSourceLicence
Lake Mashu and its caldera walls seen from an observation pointMashu Lake (52357155626)Raita Futo from Tokyo, JapanWikimedia Commons ↗CC BY 2.0
Mount Kamuinupuri and the deep blue Lake MashuLac mashuOriginal uploader (WT-fr) Newton4ever at French WikivoyageWikimedia Commons ↗Public domain
Lake Mashu in winter, enclosed by the snow-covered outer rimLake Mashū Japan during wintertime in Akan National Park HokkaidōKpravin2Wikimedia Commons ↗CC BY-SA 4.0
The green outer rim and the island in Lake MashuMashu (6035585600)Makoto NakashimaWikimedia Commons ↗CC BY 2.0
Lake Mashu and trees in early winter初冬の摩周湖(Lake Mashu of the winter) - panoramiopakkuWikimedia Commons ↗CC BY 3.0
Lake Mashu with Kamuishu Island on its still surfaceLake Mashu 2009OskNeWikimedia Commons ↗Public domain
All photo credits →