sinkhole Synonyms

swallow hole sink deepest valley artesian spring borehole caldera aquifer yama water table water level void bottomless pit cenote collapsing hole artesian basin sinks sinkage Pitt hellhole Dells chughole chuckhole cesspit trough indentation sinking culvert crater concavity cesspool cavity bowl bottomless blowhole bay decline dent depression scoop SAG pit mire hollow hole doghole ditch dip basin