Saitama Seiganji Onsen is a day-use hot spring in Nishi ward, built in 2006 around a bamboo grove, with a sodium-chloride spring at about 38°C that feeds unheated open-air pools. The men's sauna runs at about 90°C and the women's at about 85°C, followed by a cold-water bath at about 17.5°C. Indoors there is a hinoki carbonated bath. Open daily 10:00–24:00; adults pay 900 yen on weekdays and 1,000 yen at weekends.