Okaya Onsen Nagano

Okaya Onsen is a restorative hot spring in Okaya city, situated on the southeastern shore of Lake Suwa in Nagano Prefecture, a city historically important as the center of Japan's silk-reeling industry — at its peak in the early 20th century, Okaya produced more silk thread than any other city in the world. The chloride-rich thermal waters provide body-warming and skin-nourishing benefits in a setting that blends industrial heritage with the tranquil shores of mountain Lake Suwa. The lake's famous firecracker festivals, winter ice skating, and the surrounding forested mountain ridges of the Kiso and Minami Alps contribute to the rich seasonal character of an Okaya onsen visit.