A syncline of permeable rocks, outcropping at the crest. Water from rain or streams seeps into this aquifer; the rock becomes saturated, and the water is under pressure. If a hole is sunk to tap the water, an artesian well forms—water will initially flow upwards without pumping. Try B. Radke et al. (2000) on the Great Australian Artesian Basin.
Subjects: Earth Sciences and Geography.