MATSUYAMA—Hot water deep underground for several years or even decades makes hissing and whirring noises as it snakes its way to the surface through a series of pipes. The water from several sources ...

In the high country at the eastern foot of looming Mount Kujū in Kyūshū’s southwest Ōita Prefecture there is a remarkable hot spring resort town with an unusual claim to fame. It is the only ...

A device that generates energy from the temperature difference between spring water and the air is seen in this image provided by the National Institute of Advanced Industrial Science and Technology.

Lots of people in Japan like to drink hot water as a way to cleanse the digestive system and control gut health. While the science is out on whether it actually works, it’s something our reporter Mr ...