# Kotoku Onsen

Kotoku sits in the high plateau of Oku-Nikko, several kilometers north of Lake Chūzenji, in a region where the land flattens into the broad wetland of Senjōgahara before the mountains close in again. To reach it requires intent — a seventy-minute bus ride from Nikko, then a twenty-minute walk from the road. There is no shortcut, no convenient stop. The distance itself is part of what the place offers.

The water here is a calcium-sodium sulfate spring carrying sulfur, and what it does in the bath is quietly remarkable: it turns the color of pale emerald, a green that seems to come from somewhere inside the water rather than from any surface reflection. The spring is said to benefit circulation and the skin. Whether or not one arrives with particular hopes, the act of lowering into that colored water, in a bath that smells of sulfur and mountain air, has a settling quality that is difficult to describe without overstating it.

The single facility here is the Nikko Astoria Hotel, operated by Tobu Kōgyō, and its modest presence suits the surroundings. This is not the kind of place one passes through. To stay several nights is to begin to hear what the plateau sounds like — to let the sulfur scent become familiar, to notice how the light shifts over Senjōgahara at different hours. Kotoku does not announce itself. It simply remains, at the edge of the wetland, doing what it has always done.