St. Leon, formerly known as Leon and also known as St. Leon Hot Springs because of a mineral spring located nearby, is an unincorporated settlement and former hot springs resort and steamboat landing on the east side of Upper Arrow Lake in the Kootenay Country of British Columbia, Canada, located at the mouth of St. Leon Creek, between Nakusp (S) and Halcyon Hot Springs (N) (another spa/resort). The name of nearby Mount St.