Beungeut cai taneuh atawa phréatic surface nyaéta wates pangluhurna nu kakeueum ku cai taneuh. Dina zona vadose, saluhureun beungeut cai taneuh, rohangan antara partikel taneuh dieusi ku hawa, atawa hawa jeung cai (iwal ti di daérah capillary fringe). Sahandapeun eta, sakabéh rohangan taneuh kakeueum ku cai. Harti beungeut cai taneuh nyaéta wewengkon nu mana pressure head sarua jeung atmospheric pressure (nu mana gauge pressure = 0).
Lobana cai dina jero taneuh atawa batu sahandapeun beungeut cai taneuh disebutna aquifer. Nu disebut "perched aquifer" (atawa perched water table) di mana muterna cai saluhureun wewengkon nu kahalangan nu batu padas (batu nu teu bisa ngalirkeun cai).
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