Saltupju Holy Spring has since long been deemed as having healing properties. It is also considered to be a cult place where in ancient times, Selonians performed rituals. The water-rich spring forms a stream called Saltupe, which after about 100 m flows into the River Dienvidsusēja and is considered one of the longest underground springs in Latvia. The iron and sulphur compounds in the water give it a specific sulphur taste and colour the stream bed in a rusty shade. A small stone with a natural hollow is located near the spring.