Nasu Onsen (那須温泉) is a spread out hot spring resort on the slopes of Mount Nasudake, a highland area also referred to as the Nasu Highlands (那須高原, Nasu Kōgen). The center of the resort is the hot spring town of Yumoto, halfway up the mountain. Nasu's hot spring baths were discovered during the Nara Period (710-1185) and have been highly regarded for their restorative properties ever since.
Mount Nasudake is also a popular hiking destination. A ropeway leads to within a 45 minute hike of the summit. There are also a variety of hiking trails in the forests further down the mountain and a pedestrian suspension bridge that offers nice views out over the trees. Azalea bushes flower around Nasu Onsen in late May, while the autumn colors peak along the slopes in early to mid October.
The following is an incomplete list of hot spring baths that are open to the public. Some ryokan in the area also open up their baths to non-staying visitors during daytime for a small fee.
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Hourly buses operate from Nasu-Shiobara Station via Kuroiso Station to Nasu Onsen. From April to November, buses go all the way to the Nasu Ropeway Station (75 minutes, 1400 yen), while from December to March they only travel as far as Nasu Yumoto (50 minutes, 1000 yen).
How to get to and around Nasu-Shiobara