Guadalupe Canyon Hot Springs
Guadalupe Canyon Hot Springs (also known as Cañon de Guadalupe Hot Springs) are a grouping of geothermal springs located near Mexicali, Baja California, Mexico. The hot mineral water is discharged through a number of springs that divert the flow through man-made aqueducts into rock and concrete pools.
Source: Wikipedia — Guadalupe Canyon Hot Springs (CC BY-SA 4.0)