Day-trip onsen in Shinano. Bath photos from the internet Price: ¥600 Dedicated to the great tengu of Mount Iizuna. Lake Reisenji is nearby, and you can partially see it from the indoor bath and the rest area. The onsen was originally cold, 21°, so it is not an onsen, but a reikosen (冷鉱泉), a cold mineral spring that has the same effect as an onsen, according to the owner. They heat it, add regular water, and chlorinate it slightly, the smell is minor and almost unnoticeable. But the water flowing over the stones into the onsen is cold. There are two indoor baths, one a bit hotter, around 38, the other much cooler. The rotenburo is also not hot at all, which was actually nice since it was about 35 outside. Standing up, you can see the mountains, and sitting in the onsen, there is a great view of the log fence. There is a tiny sauna and a mizuburo with tap water. Shocking, all the hair dryers in the changing room are paid, stylish Refa and Dayson ones. The locals bring their own. There are massage chairs, a shop, and a large cafeteria. Nearby there is a golf club and a camp barbecue.