Chemchemi ni mahali ambapo maji yanatoka ardhini. Mara nyingi chemchemi huwa Chanzo cha mto ambao hutiririsha maji yake mpaka baharini au ziwani kama mto ni mkubwa, au ndani ya mto mwingine kama mto ni mdogo. https://www.usgs.gov/special-topic/water-science-school/science/springs-and-water-cycle?qt-science_center_objects=0#qt-science_center_objects https://www.space.com/18875-titan-nile-river-cassini.html