Deca Springs is about three kilometres west of Deca Creek on the north bank of the Twitya River in the Northwest Territories. The spring is near to the uphill side of a large tufa mound measuring 1000 feet by 500 feet that located about one kilometre north of the river. The pure, odourless water bubbles into a twenty-foot-wide pool. It is rich in dissolved minerals, including sulphate, chloride, and sodium. Crustaceans, sometimes known as small shrimp, live in the water.
Another group of Springs can be located a kilometer to the west. They have large tufa mounds but are cooler, with temperatures ranging from 11 to 16 degrees Celsius.