Hokkaido Blue Pond: Why It's Blue, Apple Wallpaper Fame & Visiting Tips

What Is the Blue Pond and Why Is It Blue

The Blue Pond (青い池, Aoi Ike) is a small man-made pond near the town of Biei in central Hokkaido. It is one of the most photographed spots in Japan, and the reason is the color — on a clear day, the water glows an intense, almost unnatural shade of electric blue. Dead birch and larch trees stand in the water, their pale trunks rising from the surface like remnants of a flooded forest. The effect is eerie and beautiful.

The pond sits within the broader landscape of Hokkaido lake destinations, but it is unlike any natural lake. It was never meant to be a tourist attraction. It was built as a disaster prevention measure, and the vivid color is an accidental byproduct of volcanic geology.

The Science: Aluminum Particles and Light Scattering

The blue color comes from microscopic particles suspended in the water. According to the Tokachidake Geopark, streams flowing from Mt. Tokachidake (十勝岳) — an active volcano upstream — carry tiny aluminum hydroxide (アルミニウム水酸化物) and silica particles eroded from volcanic rock. These colloidal particles are extraordinarily small, measuring between 1/10,000 and 1/1,000,000 of a millimeter.

When sunlight hits the pond, these particles scatter blue wavelengths of light while absorbing red wavelengths — a process similar to what makes the sky blue. The result is water that appears intensely turquoise or cobalt depending on the angle and light conditions. The mineral-rich water flows in continuously from volcanic streams, keeping the particle concentration high.

Why the Color Disappears on Cloudy Days

The blue effect depends entirely on direct sunlight. Without it, the light-scattering mechanism does not activate, and the pond looks like an ordinary gray-green body of water. This is one of the most common disappointments for visitors — many travelers on Reddit report arriving on overcast days and seeing almost no blue at all.

If you are planning a visit specifically for the color, check the weather forecast and prioritize clear-sky days. Morning light tends to produce the most saturated blue, as the sun angle illuminates the particles most effectively. Wind also matters — calm water reflects more evenly, while choppy surface conditions diffuse the color.

How a Disaster Prevention Dam Became Famous

The Blue Pond was not designed to be beautiful. According to the Biei Town official tourism site, it was created after the December 1988 eruption of Mt. Tokachidake. Concerned about volcanic mudflows reaching downstream towns, authorities constructed a concrete check dam (チェックダム) across the Biei River to catch debris. The dam was completed in June 1989.

Water backed up behind the dam naturally, submerging a section of forest. The birch and larch trees trapped in the rising water died but remained standing — their bleached trunks became the ghostly silhouettes that give the pond its distinctive atmosphere. The volcanic mineral water flowing in from upstream provided the accidental blue coloring.

For years, the pond was essentially unknown. It was a functional piece of infrastructure in a forested area, visited only by locals who happened upon it. There were no signs, no parking lot, no official name. The name "Blue Pond" (青い池) was coined informally by visitors who noticed the color.

The Apple Wallpaper That Changed Everything

In 2012, Apple included a photograph of the Blue Pond as a default wallpaper in OS X Mountain Lion. The image — a winter scene of the frozen pond with snow-covered dead trees — was taken by local photographer Kent Shiraishi, who had been documenting the pond for years.

Overnight, a pond that most Japanese people had never heard of appeared on millions of computer screens worldwide. The image perfectly captured the otherworldly quality of the scene: electric blue water, stark white trees, and the quiet tension of a landscape that looks too vivid to be real.

The effect on Biei was dramatic. Tourism to the Blue Pond surged. The town built a parking lot, installed boardwalks, added signs, and eventually began a winter illumination program to extend the season. What was once an accidental byproduct of disaster prevention became central Hokkaido's most recognizable image.

Kent Shiraishi's photograph did for the Blue Pond what Ansel Adams did for Yosemite — it gave an overlooked landscape a visual identity that transcended geography. The Apple wallpaper remains the single most important event in the pond's history as a tourist destination.

How the Color Changes Across Seasons

The Blue Pond is not a one-look destination. The color and atmosphere shift dramatically depending on when you visit.

Summer: Vivid Electric Blue

June through August is the peak season for the iconic blue color. Long daylight hours and frequent clear skies create the conditions for the most saturated blue. The surrounding forest is deep green, and the contrast between the blue water and the white dead trees is at its strongest.

Summer is also the busiest season. Expect crowds at midday, especially on weekends. For the best light and fewer people, arrive before 9:00 AM.

Winter: Frozen White with Night Illumination

In winter, the pond freezes over and the blue disappears under ice and snow. The landscape transforms into a monochrome scene — white ice, white snow, pale tree trunks against a gray sky. It is a completely different experience from summer, and many visitors find the winter version equally compelling.

Since 2014, the town has run a winter illumination program (ライトアップ), lighting the frozen pond and surrounding trees with colored lights after dark. The illumination creates a fantasy landscape that photographs beautifully against the Hokkaido winter night. Check the Biei tourism office for current illumination dates and hours, as the schedule varies by year.

The frozen surface can be slippery — wear boots with good traction.

Visiting the Blue Pond: What to Know

The Blue Pond is open 24 hours, year-round, and admission is free. A dedicated parking lot charges ¥500 (~$3) per visit.

From Biei Station (美瑛駅), take the bus toward Shirogane Onsen (白金温泉) and get off at the Blue Pond entrance — about 20 minutes, costing ¥540 (~$4). From Asahikawa, take the JR Furano Line to Biei Station (approximately 30 minutes), then transfer to the bus.

A boardwalk runs along the pond's edge, providing the main viewing angles. The walk takes about 15 to 20 minutes at a leisurely pace. Photography is best from the boardwalk's western end, where you get the classic view of dead trees rising from the blue water with the forest behind.

For detailed logistics, seasonal photography tips, and combining Blue Pond with other Biei attractions, see our Blue Pond visiting guide.

Frequently Asked Questions