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Seikan Undersea Tunnel

Seikan Undersea Tunnel

The Seikan Undersea Tunnel is the longest railroad tunnel in the world that goes under water. It is a rail that connects the island Hokkaido with the main one known as Honshu.

The Seikan Undersea Tunnel is 54 kilometers (33 miles) long and goes about 240 meters (14 miles) under the Tsugaru Strait. It was a project that took 17 years to finish and cost about 530 billion yen to build. Its’ construction began in 1971 by the Japanese National Railways. Prior to its construction the idea of a tunnel was considered in the Taisho period (1912-1925), but surveying did not begin until after World War II and the sinking of the Toya Maru ferry. The construction of the tunnel was to help increase traffic between Honshu and Hokkaido because of the economic boom when everyone was traveling more than usual.
BR> Predicted passenger numbers were too much for the ferries back then to handle. At the completion of the tunnel in 1988 all railway transports between Hokkaido and Honshu utilized it. In one day there were 50 scheduled trains using the Seikan Undersea Tunnel from Shin Aomori to Shin Hakodate. Then in 2016 Shinkansen (bullet trains) trains were able to use the tunnel. This new service allowed travel time to be cut down by two hours. It is a great achievement and proof of the engineering capabilities that were put into the Seikan Undersea Tunnel.

Please see below for tours that include Seikan Undersea Tunnel:

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    question mark icon         Tour#: GTZ1096511

Charms of Northern Japan (Reverse): Autumn Leaves Tour arrow readmore icon

Nikko / Matsushima / Hiraizumi / Morioka / Towada / Aomori / Seikan Tunnel / Hakodate / Lake Toya / Noboribetsu / Shiraoi / Otaru / Sapporo

    10 reviews

9 Days 8 Nights | from US $3798.00

The must see sights of Tohoku & Hokkaido...plus fall foliage in Autumn.

Start Date End Date Twin/Triple Start City End City Style Save Status
Mon. Oct 13, 2025 Tue. Oct 21, 2025 US $3798.00 Tokyo Sapporo Deluxe Guarantee / Book Now  
Tue. Oct 13, 2026 Wed. Oct 21, 2026 US $3798.00 Tokyo Sapporo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTE235435

Charms of Northern Japan: Autumn Leaves Tour arrow readmore icon

Sapporo / Otaru / Shiraoi / Noboribetsu / Lake Toya / Hakodate / Seikan Tunnel / Aomori / Towada / Morioka / Hiraizumi / Matsushima / Nikko

    10 reviews

9 Days 8 Nights | from US $3798.00

The must see sights of Hokkaido &Tohoku...plus fall foliage in Autumn.

Start Date End Date Twin/Triple Start City End City Style Save Status
Sat. Nov 1, 2025 Sun. Nov 9, 2025 US $3798.00 Sapporo Tokyo Deluxe Guarantee / Book Now  
Sat. Nov 7, 2026 Sun. Nov 15, 2026 US $3798.00 Sapporo Tokyo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTG100781

Charms of Northern Japan (Reverse): Cherry Blossom Tour arrow readmore icon

Omiya / Nikko / Matsushima / Hiraizumi / Kitakami / Morioka / Seikan Tunnel / Hakodate / Lake Toya / Noboribetsu / Shiraoi / Otaru / Sapporo

    10 reviews

9 Days 8 Nights | from US $3898.00

The must see sights of Tohoku & Hokkaido...plus cherry blossom in Spring.

Start Date End Date Twin/Triple Start City End City Style Save Status
Fri. Apr 18, 2025 Sat. Apr 26, 2025 US $3898.00 Tokyo Sapporo Deluxe Guarantee / Book Now  
Sat. Apr 18, 2026 Sun. Apr 26, 2026 US $3898.00 Tokyo Sapporo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTR1898545

Charms of Northern Japan Tour (Reverse): Cherry Blossoms & Wisteria arrow readmore icon

Ashikaga / Nikko / Matsushima / Hiraizumi / Kitakami / Morioka / Seikan Tunnel / Hakodate / Lake Toya / Noboribetsu / Shiraoi / Otaru / Sapporo

    10 reviews

9 Days 8 Nights | from US $3898.00

The must see sights of Tohoku & Hokkaido...plus cherry blossoms & wisteria in Spring.

Start Date End Date Twin/Triple Start City End City Style Save Status
Sun. Apr 27, 2025 Mon. May 5, 2025 US $3898.00 Tokyo Sapporo Deluxe Guarantee / Book Now  
Sun. Apr 26, 2026 Mon. May 4, 2026 US $3898.00 Tokyo Sapporo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTA1021089

Charms of Northern Japan: Cherry Blossoms & Baby Blue Eyes Flowers arrow readmore icon

Sapporo / Otaru / Shiraoi / Noboribetsu / Lake Toya / Hakodate / Seikan Tunnel / Morioka / Hiraizumi / Matsushima / Nikko / Hitachi Seaside Park

    10 reviews

9 Days 8 Nights | from US $3898.00

The must see sights of Hokkaido & Tohoku with spring cherry blossoms and baby blue eye flowers at Hitachi Seaside Park.

Start Date End Date Twin/Triple Start City End City Style Save Status
Sat. May 3, 2025 Sun. May 11, 2025 US $3898.00 Sapporo Tokyo Deluxe Guarantee / Book Now  
Sun. May 3, 2026 Mon. May 11, 2026 US $3898.00 Sapporo Tokyo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTR1717185

Charms of Northern Japan Tour: Tohoku 3 Great Summer Festivals arrow readmore icon

Furano / Biei / Otaru / Sapporo / Shiraoi / Noboribetsu / Lake Toya / Hakodate / Seikan Tunnel / Aomori / Akita / Kakunodate / Hiraizumi / Sendai / Matsushima / Urabandai / Aizu Wakamatsu / Nikko

    10 reviews

12 Days 11 Nights | from US $4998.00

The must see sights of Hokkaido & Tohoku...plus Tohoku 3 Great Summer Festivals.

Start Date End Date Twin/Triple Start City End City Style Save Status
Tue. Jul 29, 2025 Sat. Aug 9, 2025 US $4998.00 Sapporo Tokyo Deluxe Guarantee / Book Now  
Wed. Jul 29, 2026 Sun. Aug 9, 2026 US $4998.00 Sapporo Tokyo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTH2373102

Hokkaido, Tohoku & Central Japan: Autumn Leaves & Cherry Blossoms arrow readmore icon

Hokkaido (Sapporo / Otaru / Shiraoi / Noboribetsu / Lake Toya / Hakodate), Tohoku (Seikan Tunnel / Aomori / Towada / Morioka / Hiraizumi / Matsushima), Central Japan (Nikko / Tokyo / Mt Fuji / Hakone / Obara / Takayama / Shirakawa-go / Kanazawa / Kyoto / Nara / Osaka)

    4 reviews

16 Days 15 Nights | from US $6598.00

Exploring Japan's two main islands: Hokkaido & Honshu…plus enjoy the Obara Shikizakura Festival, where fall foliage and cherry blossoms appear at the same time.

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Sat. Nov 1, 2025 Sun. Nov 16, 2025 US $6598.00 Sapporo Osaka Deluxe Guarantee / Book Now  
Sat. Nov 7, 2026 Sun. Nov 22, 2026 US $6598.00 Sapporo Osaka Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTO1017569

Hokkaido, Tohoku & Central Japan (Reverse): Takayama Festival & Cherry Blossoms arrow readmore icon

Central Japan (Nara / Kyoto / Kanazawa / Shirakawa-go / Takayama / Mt Fuji / Hakone / Tokyo / Nikko), Tohoku (Matsushima / Hiraizumi / Kitakami / Morioka / Seikan Tunnel), Hokkaido (Hakodate / Lake Toya / Noboribetsu / Shiraoi / Otaru / Sapporo)

    4 reviews

16 Days 15 Nights | from US $6698.00

Travel on a cherry blossom filled journey through Honshu and Hokkaido, and experience the Takayama Spring Festival.

Start Date End Date Twin/Triple Start City End City Style Save Status
Fri. Apr 11, 2025 Sat. Apr 26, 2025 US $6698.00 Osaka Sapporo Deluxe Guarantee / Book Now  
Sat. Apr 11, 2026 Sun. Apr 26, 2026 US $6698.00 Osaka Sapporo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTD193452

Hokkaido, Tohoku & Central Japan Tour (Reverse): Cherry Blossoms & Wisteria arrow readmore icon

Central Japan (Nara / Kyoto / Kanazawa / Shirakawa-go / Takayama / Matsumoto / Mt Fuji / Hakone / Tokyo / Ashikaga / Nikko), Tohoku (Matsushima / Hiraizumi / Kitakami / Morioka / Seikan Tunnel), Hokkaido (Hakodate / Lake Toya / Noboribetsu / Shiraoi / Otaru / Sapporo)

    4 reviews

16 Days 15 Nights | from US $6698.00

Experience Japan's famous cherry blossom trees and captivating wisteria flowers while exploring popular attractions and local gems.

Start Date End Date Twin/Triple Start City End City Style Save Status
Sun. Apr 20, 2025 Mon. May 5, 2025 US $6698.00 Osaka Sapporo Deluxe Guarantee / Book Now  
Sun. Apr 19, 2026 Mon. May 4, 2026 US $6698.00 Osaka Sapporo Deluxe Guarantee / Book Now  
    question mark icon         Tour#: GTH1105193

Hokkaido, Tohoku & Central Japan (Reverse): Takayama Festival & Autumn Leaves arrow readmore icon

Central Japan (Nara / Kyoto / Kanazawa / Shirakawa-go / Takayama / Mt Fuji / Hakone / Tokyo / Nikko), Tohoku (Matsushima / Hiraizumi / Morioka / Towada / Aomori / Seikan Tunnel), Hokkaido (Hakodate / Lake Toya / Noboribetsu / Shiraoi / Otaru / Sapporo)

    4 reviews

16 Days 15 Nights | from US $6698.00

Exploring Japan's two main islands: Honshu & Hokkaido, as well as the Takayama Hachiman Autumn Festival.

Start Date End Date Twin/Triple Start City End City Style Save Status
Mon. Oct 6, 2025 Tue. Oct 21, 2025 US $6698.00 Osaka Sapporo Deluxe Guarantee / Book Now  




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