Tomamu Unkai (Sea of Clouds)

Overview & Charm

Unkai Terrace, located at Hoshino Resorts Tomamu, is an observation facility where you can witness the breathtaking sight of a dynamic sea of clouds when specific meteorological conditions are met. Situated near the summit of Mt. Tomamu, it offers a profound experience of 'living above the clouds.' Visitors can enjoy the shifting expressions of the clouds as they change by the minute, creating a constantly evolving natural spectacle.

History & Background

The concept of Unkai Terrace was born from the passion of the staff members who maintained the gondolas during the summer. They wanted to share the stunning views they witnessed with the guests. Rather than just a simple observation deck, it has become a beloved destination that offers a way to 'experience' a natural phenomenon. The facility maintains a deep respect for nature, even implementing its own specialized 'Unkai Forecast' to help visitors time their visits.

Seasonal & Time-of-Day Recommendations

The Unkai Terrace is primarily operational during the season from mid-June to mid-October. The ideal conditions for the sea of clouds occur when the wind is weak from the previous night through the early morning, accompanied by a sharp drop in temperature. A particularly rare phenomenon at Tomamu is the 'Pacific Sea of Clouds,' caused by warm air flowing in from the Pacific Ocean. Additionally, even during cloudy weather, you may witness 'bad weather sea of clouds' characterized by thick mist, offering a completely different atmosphere depending on the weather.

What to Bring, Clothing & Etiquette

Access to Unkai Terrace is strictly via the 'Unkai Gondola'; it is not accessible by foot or car. Please be aware that temperatures and weather conditions change drastically. Even in summer, early morning temperatures can drop to single digits (Celsius). It is essential to bring heavy winter gear, such as down jackets, thick coats, knit hats, gloves, and neck warmers. While personal photography is permitted, any photography or recording for commercial purposes requires prior authorization.

Important Notes

The probability of the sea of clouds appearing is approximately 40% during the season. Therefore, we highly recommend checking the official 'Unkai Forecast' before your visit. Please note that gondola operations may be suspended due to weather conditions, or visibility may become extremely poor. As this experience depends entirely on natural phenomena, please understand that the experience is subject to the daily weather and environmental conditions.