anthropogenic geographic feature well A cylindrical hole, pit, or tunnel drilled or dug down to a depth from which water, oil, or gas can be pumped or brought to the surface. ENVO ENVO:00000026 EcoLexicon:well FTT:1032 FTT:1237 FTT:833 Geonames:H.WLL Geonames:H.WLLS SWEETRealm:Well TGN:51255 WELL Wikipedia:Well brine well oil well water well well wells