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Home - Travel - Sightseeing Guide - Hokkaido - Akan National Park
Lake Mashu (Mashuko) 
# 2   of 5 most visited sights
in Akan National Park

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Lake Mashu (, Mashūko) is a caldera lake in Akan National Park. It vies for the position of "clearest lake in the world", and is considered by many to be Japan's most beautiful lake. Lake Mashu is also one of the country's deepest lakes and although it is usually appreciated for its clear blue water, it is also famously and frequently blanketed in heavy fog.

Visitors are not allowed to go down to the lake, however there are two observation decks positioned around the rim of the caldera from where you can enjoy views. Observation Deck Number 3 lies along the western rim of the caldera and consists of two decks with unobstructed views onto the lake and Mount Mashudake. Besides free parking, there are no facilities provided.

Observation deck number 3

A five minute drive to the south lies the Observation Deck Number 1, which comes with a paid parking lot (the 410 yen fee includes parking at nearby Mount Iozan), multiple viewing decks, toilets and a large shopping area with a food stand offering various Hokkaido specialties. An observation deck number 2 used to exist between decks number 1 and 3, but has been closed to the public.

Those who wish to view Lake Mashu from even more angles will enjoy the hiking trail which leads from Observation Deck Number 1 along the rim of the caldera a third around the lake to the summit of Mount Mashudake, the prominent volcanic peak on the western side of the lake. The trail leads through forest and grassland for about seven kilometers and takes about 2.5 to 3 hours to hike one way.

Hiking trail to Mount Mashudake

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How to get there
By car

Due to very poor public transportation, the recommended way to visit Lake Mashu is by rental car. The observation decks overlooking the lake can be reached in a little bit over an hour from Lake Akan or in 15 to 20 minutes from Kawayu and Lake Kussharo.

By bus

From August to late October, infrequent buses connect Lake Mashu's observation decks with JR Mashu Station in central Teshikaga (20 minutes) and with the western shores of Lake Kussharo (2 hours) via JR Kawayu Onsen Station (25 minutes), Mount Iozan (35 minutes) and the town of Kawayu Onsen (1 hour). A 2-day passport for the buses is available for 1500 yen. A 3-day pass for 2000 yen.

From late April through July, buses run only between Mashu Station and observation deck number one (20 minutes, 560 yen one way). During the rest of the year, there is no bus service, at all.

How to get to and around Akan National Park

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User Ratings
Ratings for Lake Mashu:
japan-guide.com Rating:
  outstanding  
User Rating (by 73 users):
84/100
  recommended

Best rated sights nationwide (out of 783):
231.  Ueno Park (Tokyo)   84/100
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233.  Prefectural Museum (Miyazaki)   84/100
234.  Nagasaki Kunchi (Nagasaki)   84/100
235.  Jigokudani (Noboribetsu)   84/100
236.  Lake Mashu (Akan National Park)   84/100
237.  Hot Springs (Minakami)   83/100
238.  Five Lakes (Shiretoko)   83/100
239.  Koishikawa Korakuen (Tokyo)   83/100
240.  Furano Ski Area (Furano)   83/100
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322.  Ivy Square (Kurashiki)   207
323.  Magome (Kiso Valley)   205
324.  Lake Mashu (Akan National Park)   205
325.  Minoo Park (Osaka)   205
326.  Kompirasan (Kotohira)   203
327.  Takasaki Monkey Park (Beppu)   203
328.  Zao Ski Resort (Zao)   201

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We strive to keep japan-guide.com up-to-date and accurate, and are always looking for ways to improve the user experience. If you have any updates, suggestions, corrections or opinions, please let us know:

Japanese Links
Akan Bus
Official website of the local bus operator.
Teshikaga Eco Passport
Official website.

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