1. Hikers at Tsueno Peak in Kumano City, Japan witnessed a rare and stunning natural phenomenon on Sunday morning - an ethereal sight of white clouds undulating like an ocean from the peak's 495-meter altitude.

2. The breathtaking display was caused by a sharp temperature drop close to 10 degrees Celsius around dawn, with the clouds turning orange as the sun rose over nearby mountains.

3. The sea of clouds may appear on mornings from this time of year through winter if the skies are clear and there is a significant temperature drop at dawn. A visitor described the sight as indescribably beautiful.