In karst terminology, a flat-floored, steep-sided, enclosed basin up to 65 km long and 10 km wide. Streams can be ephemeral or permanent; usually the water drains into streamsinks. Most poljes are aligned with underlying structures such as folds, faults, and troughs. See Nicod (2003) Acta Carsalogica 32, 2 and Miller (2006) GSA Sp. Paper 406.