The pic shows the center of Kusatsu-spa area. The steam goes up to the cloudy sky, and beneath the sky, there are several lines of rectangles on the bare bedrock. This place is called "yubatake", which means "a field of spa". In case you don't have any images about a relationship between a field and spa, at first, you try to image a field of a corn, potato or whatever. Instead of vegetables, this place seems to grow a hot-spring. So, inside rectangles, which seem to be box connected with each other, there are plenty of hot water sprang from the rock. The steam comes from there. The main function of this field is that it can adjust the heat of the hot spring while the hot water running through it, and moreover, it produces "yunohana", which means "a flower of hot spring". This flower is, in fact, a deposit or sediment of a spa that contains plenty of hot-spring-ingredient.
Here is Kusatsu, Japan
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