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Hokkaido | Akan National Park

Lake Mashu

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Lake Mashu

Lake Mashu is located in the Akan National Park and is 12 kilometers away from the Kawayu Onsen. It is a caldera lake that was formed about 7,000 years ago by an eruption. Due to a study done in 1931, this lake’s water is ranked as the clearest in the world, closely followed by Lake Baikal. The color of the water in the lake is referred to as Mashu blue. The different hues of the lake give a mysterious feeling to those that gaze at the pure water. There are multiple places to view this divine lake. The three main ones are Observation Deck 1, Observation Deck 3 and Uramshu Observatory. There was Observation Deck 2, which was in between 1 and 3, but was closed and is no longer open to the public. Lake Lake Mashu is located in the Akan National Park and is 12 kilometers away from the Kawayu Onsen. It is a caldera lake that was formed about 7,000 years ago by an eruption. Due to a study done in 1931, this lake’s water is ranked as the clearest in the world, closely followed by Lake Baikal. The color of the water in the lake is referred to as Mashu blue. The different hues of the lake give a mysterious feeling to those that gaze at the pure water. There are multiple places to view this divine lake. The three main ones are Observation Deck 1, Observation Deck 3 and Uramshu Observatory. There was Observation Deck 2, which was in between 1 and 3, but was closed and is no longer open to the public. Lake Mashu was originally called Lake of the Devil by the Ainu a long time ago and the Japanese later called it Lake Mashin. It later was changed to Lake Mashu in reference to the nearby Mount Mashu. Commonly today the peak is called Kamuinupuri (mountain of the gods) and the lake is referred to as Kamuito (lake of the gods) by the Ainu.



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Charms of Hokkaido: Summer Flowers & Nature

Group Tour | Luxury        

Charms of Hokkaido: Summer Flowers & Nature

9 Days 8 Nights | from US $3698.00

Sapporo / Otaru / Furano / Biei / Asahikawa / Hokuryu / Sounkyo / Kitami / Abashiri / Shiretoko / Lake Mashu / Lake Akan / Kushiro
This delightful itinerary brings our guests through fields of cheerful summer flowers to explore the incredible nature of Furano, Biei, the Shiretoko Peninsula, and Kushiro on this relaxing Charms of Hokkaido summer tour.
Start Date End Date Twin/Triple Start City End City Style Compare Status
Sun. Aug 13, 2023 Mon. Aug 21, 2023 US $3698.00 Sapporo Kushiro Luxury Save this tour Book Now  
Sun. Aug 18, 2024 Mon. Aug 26, 2024 US $3698.00 Sapporo Kushiro Luxury Save this tour Book Now  
Sun. Aug 17, 2025 Mon. Aug 25, 2025 US $3698.00 Sapporo Kushiro Luxury Save this tour Book Now  
Best of Hokkaido & Honshu: Summer Flowers & Nature

Group Tour | Luxury        

Best of Hokkaido & Honshu: Summer Flowers & Nature

15 Days 14 Nights | from US $5998.00

Hokkaido (Sapporo / Otaru / Furano / Biei / Asahikawa / Hokuryu / Sounkyo / Kitami / Abashiri / Shiretoko / Lake Mashu / Lake Akan / Kushiro), Honshu (Osaka / Nara / Kyoto / Koka / Hakone / Mt Fuji / Tokyo)
Join this 15-day summer tour through the enchanting summer flowers of Hokkaido plus the top sightseeing destinations of the Japan mainland.
Start Date End Date Twin/Triple Start City End City Style Compare Status
Sun. Aug 13, 2023 Sun. Aug 27, 2023 US $5998.00 Sapporo Tokyo Luxury Save this tour Book Now  
Sun. Aug 18, 2024 Sun. Sep 1, 2024 US $5998.00 Sapporo Tokyo Luxury Save this tour Book Now  
Sun. Aug 17, 2025 Sun. Aug 31, 2025 US $5998.00 Sapporo Tokyo Luxury Save this tour Book Now  
Charms of Hokkaido: Autumn Leaves & Salmon Run

Group Tour | Luxury        

Charms of Hokkaido: Autumn Leaves & Salmon Run
12 reviews

9 Days 8 Nights | from US $3698.00

Chitose / Shiraoi / Sapporo / Otaru / Asahikawa / Sounkyo / Kitami / Abashiri / Shiretoko / Lake Mashu / Lake Akan / Kushiro
Visit Hokkaido during the vibrant autumn season in time to see the annual Salmon Run, and experience the island's natural beauties as well as the native culture of the Ainu.
Start Date End Date Twin/Triple Start City End City Style Compare Status
Sun. Oct 15, 2023 Mon. Oct 23, 2023 US $3698.00 Sapporo Kushiro Luxury Save this tour Book Now  
Sun. Oct 13, 2024 Mon. Oct 21, 2024 US $3698.00 Sapporo Kushiro Luxury Save this tour Book Now  
Sun. Oct 19, 2025 Mon. Oct 27, 2025 US $3698.00 Sapporo Kushiro Luxury Save this tour Book Now  
Best of Hokkaido & Honshu: Autumn Leaves & Salmon 
Run

Group Tour | Luxury        

Best of Hokkaido & Honshu: Autumn Leaves & Salmon Run

15 Days 14 Nights | from US $5998.00

Hokkaido (Chitose / Shiraoi / Sapporo / Otaru / Asahikawa / Sounkyo / Kitami / Abashiri / Shiretoko / Lake Mashu / Lake Akan / Kushiro), Honshu (Nara / Kyoto / Koka / Hakone / Mt Fuji / Tokyo)
This autumn tour through Japan combines the enchanting fall colors of Hokkaido with the best sightseeing spots of Honshu.
Start Date End Date Twin/Triple Start City End City Style Compare Status
Sun. Oct 15, 2023 Sun. Oct 29, 2023 US $5998.00 Sapporo Tokyo Luxury Save this tour Book Now  
Sun. Oct 13, 2024 Sun. Oct 27, 2024 US $5998.00 Sapporo Tokyo Luxury Save this tour Book Now  
Sun. Oct 19, 2025 Sun. Nov 2, 2025 US $5998.00 Sapporo Tokyo Luxury Save this tour Book Now