What do you think is this one that sits at the entrance of the tourist guide center? The correct answer is the "lignite seam" that is the basis of Mole Onsen. It was created by the accumulation of plants such as reeds that grew naturally on the banks of the Tokachi River in ancient times. Springing out through this lignite seam is the plant-based mall hot spring. The collaboration of humus (humic substances) contained in lignite and alkali gives a smooth and mild spring quality, which is why it is called a beautiful hot spring. Please come ? and enter Mall Onsen, which is registered as a Hokkaido Heritage Site.