What Is Kagami-numa Pond, Home of the Hachimantai Dragon Eye?
Kagami-numa Pond is a crater lake at an elevation of about 1,600 m along the summit walking trail of Hachimantai, and it is known as the "Hachimantai Dragon Eye" because the spring snowmelt forms a pattern resembling a dragon's eye.
As the snow melts, a ring of blue water forms around the snow remaining in the center, creating the appearance of a dragon's pupil.
A Natural Landscape at the Summit of Hachimantai
Kagami-numa is an outdoor mountain destination reached on foot, not an indoor sightseeing facility.
Plan for a mountain walk in lingering snow rather than a stroll through a city park. This will help you choose suitable clothing and allow enough time.
The surrounding area lies within a Special Protection Zone of Towada-Hachimantai National Park, where the sensitive natural environment is carefully protected.
The Dragon Eye Is a Temporary Form Created by Snowmelt
The Dragon Eye is a natural phenomenon created by the interaction of accumulated snow, meltwater, temperature, and weather conditions at Kagami-numa.
Even in the same season, the outline, the color of the water surface, and the shape of the snow remaining in the center change, so it is important to check the current condition with updated photos before heading out.
The clearly defined "open eye" may last only a few days, so seeing it depends on the timing of your visit.
Its Location Is on the Semboku City Side of Akita Prefecture
From the name "Hachimantai Dragon Eye," people often assume it is within Hachimantai City in Iwate Prefecture, but Kagami-numa is located in Tamagawa, Tazawako, Semboku City, Akita Prefecture.
Tourism and road updates are also published by organizations such as the Hachimantai City Tourism Association. Check information from both sides of the prefectural border when planning your visit.
Best Time to See the Hachimantai Dragon Eye
The appearance of Kagami-numa is not determined by the date alone; it changes according to that year's snowfall, temperature, rain, and wind.
Instead of relying on one exact date, plan to appreciate the changing stages of the snowmelt.
The Best Time Is the Lingering-Snow Season from Mid-May to Mid-June
As a rough guide, the Hachimantai Dragon Eye can be seen from mid-May to mid-June in a typical year.
The peak "eye-opening" stage, when the blue ring becomes clearly visible, usually occurs from late May to early June, although the timing varies by year.
The time when the ring takes shape and the blue water surface spreads is not the same every year, and there is no guarantee that you will see the fully opened eye on the day you arrive.
How the Dragon Eye Forms and Its Four Stages
At snow-covered Kagami-numa, melting begins beneath the surface. Water then appears around the edges, while the snow remaining in the center gradually forms an eye-like shape.
The table below summarizes the main stages of the snowmelt and what to look for.
| Stage | How It Looks | What to Notice |
|---|---|---|
| Snowfield | All white | The central hollow |
| Rim | Water surface in an arc | Change in outline |
| Center | Looks like a black pupil | Progress of snowmelt |
| Eye-opening | Blue ring spreads | Light and water |
How the Water's Color Changes in Clear and Cloudy Weather
When it is clear and the color of the sky is reflected on the water, the blue tends to look vivid, while on cloudy days it takes on a calmer expression tinged with white and gray.
Do not expect the water to match promotional photos exactly. Its color changes with the day's light and the condition of the snow surface.
Check Updated Information Before You Set Out
The eye-opening status of the Dragon Eye can be checked in the updated "Dragon Eye Information."
Also check road conditions, the summit weather, and the summit live camera provided by the Iwate Prefecture Road Information Service. Be ready to change your plans based on current conditions.
How to Get to Kagami-numa and What to Wear in the Lingering-Snow Season
The route to Kagami-numa follows a summit walking trail. During the Dragon Eye season, about 1 m of snow may remain on parts of the trail.
Wear footwear suitable for wet snow and slippery ground rather than casual shoes used for ordinary sightseeing.
Walk from Mikaeri-toge Parking Lot near the Hachimantai Summit Rest House
From the trailhead beside Mikaeri-toge Parking Lot at the Hachimantai summit, the walk to Kagami-numa takes about 20 minutes.
Because this section is a sustained uphill walk over snow, allow at least 40 minutes for the round trip, plus extra time for photos and rest breaks.
Falls, especially on the descent, cause injuries every year. In this mountain environment, an ambulance may take about an hour to arrive.
Choose Rain Boots or Hiking Boots That Handle Snow and Water
While snow remains beyond the Kagami-numa junction, wear waterproof, slip-resistant rain boots or high-cut hiking boots that support the ankles.
Facilities in the Hachimantai summit parking area offer paid rentals of rain boots and trekking poles. Sizes and quantities are limited, so bringing properly fitted footwear is the safest option.
- Non-slip, waterproof shoes
- Warm clothing that is easy to put on and take off
- A bag that keeps your hands free
- An outer layer for rain and snow
Prepare for the Temperature Difference and Weather Changes at 1,600 m
Conditions at the Hachimantai summit, about 1,600 m above sea level, differ greatly from those in the towns below. During the Dragon Eye season, temperatures can fall below 10°C on cloudy or rainy days, and wind can make it feel even colder.
Wear several light layers that you can add or remove as needed. A wind-resistant outer layer, such as a windbreaker or lightweight down jacket, is useful for both walking and viewing.
Safety Rules and Photo Etiquette to Follow at Kagami-numa
Do not climb down toward Kagami-numa, even if you are tempted to get closer to the ring. The restriction protects both visitors and the natural environment.
Follow on-site signs, ropes, and staff instructions, and observe only from designated areas.
Do Not Step onto the Pond or Ice
Because the ice may break, never step onto the pond surface.
Even when the surface looks white and stable, water moves beneath the snow, and the thickness of the ice cannot be judged by appearance alone.
Take Photos Only After Securing Safe Footing
Walking while looking at your screen makes it harder to notice steps in the snow and slippery spots.
Check your surroundings from a spot where you can stand still, and take photos from a position that does not block the flow of people passing by.
Actions That Balance Safety and Nature Conservation
The table below summarizes safe behavior for viewing and photographing Kagami-numa.
| Situation | Preferred Action | Action to Avoid |
|---|---|---|
| Observing | View from designated spots | Going down to the pond |
| Walking | Check your footing | Walking while looking at your screen |
| Photography | Take turns and keep moving | Occupying the path |
| Guidance | Follow on-site signs | Entering restricted areas |
Leave No Litter and Protect the Quiet Scenery
Take your food, drinks, and packaging home with you, and stow items that easily blow away inside your bag.
Many visitors come to enjoy the natural sounds and scenery, so keep noise to a minimum and be considerate of others.
Plan for Crowds and Changing Access Conditions
Visitor numbers increase during the Dragon Eye season, and traffic congestion can occur around the Hachimantai Aspite Line.
Leave flexibility in your schedule for traffic delays, late arrivals, and weather-related changes.
Visit Later in the Day to Avoid Peak Crowds
At peak times, congestion around the parking lot may last for several hours, even on weekdays. Visiting later in the day may help you avoid the busiest period.
After the spring reopening, the Aspite Line may close overnight, and mornings can be busy with visitors waiting for the gate to open. Check the day's road restrictions before departure.
Check Current Information for Each Transportation Option
By car, a common route is to take National Route 341 from Lake Tazawa toward Tamagawa, then continue along the Aspite Line to the Hachimantai summit. Check current road information and follow on-site guidance.
For public transportation, confirm whether seasonal services are running and check the timetable for your visit date. Mountain road and bus conditions can change with the season and weather, so rely on current service updates.
Explore Hachimantai's Nature Beyond the Dragon Eye
You can visit Kagami-numa and return directly, but when trail and weather conditions allow, exploring Hachimantai's ponds and wetlands gives you a fuller sense of the area.
After the lingering snow recedes, the summit walking trails offer changing waterside scenery and alpine plants.
A Summit Area Dotted with Crater Lakes and Ponds
The Hachimantai Nature Trail passes ponds of various sizes. Beyond Kagami-numa, you can see other waterside landscapes, including Hachiman-numa Pond and Gama-numa Pond.
If trail junctions are difficult to see because of snow or fog, do not continue farther. Follow the signs and current on-site guidance.
What to See in Each Season
The Dragon Eye appears during the lingering-snow season. After the snow melts, wetland plants emerge, and in autumn the grasses turn golden, giving the summit area a different character in each season.
The table below shows how the highlights and preparation needs change by season.
| Seasonal Condition | Main Way to Enjoy | Focus of Preparation |
|---|---|---|
| Lingering-snow season | Observe the snowmelt | Waterproofing and warmth |
| After the snowmelt | Stroll the ponds | Rain and sun protection |
| Alpine plant season | Observe the marshes | Protect the trails |
| Autumn leaves season | Admire the colors | Prepare for the cold |
Enjoy More Than the Perfect Dragon Eye
Even if the ideal ring is not visible, the cracks in the snow, the color of the water, and fog drifting across the landscape create scenery unique to that day.
Instead of trying to recreate a photo of the perfect ring, take time to observe the natural changes in progress.
Summary | Visit Kagami-numa Safely and Enjoy Hachimantai's Seasonal Scenery
The Hachimantai Dragon Eye at Kagami-numa is a seasonal natural phenomenon created by the spring snowmelt, and how it looks and when it appears change with each year's weather and snowfall.
Before visiting, check the latest viewing updates, road conditions, transportation, and weather. Bring rain boots or hiking boots suitable for snowy paths, along with layered clothing.
At the site, do not descend toward the pond. Follow the guidance, observe from a safe location, and appreciate both the Dragon Eye and the changing mountain scenery around it.
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