Department of the Environment and Heritage, 2004
Subterranean wetlands include all underground areas containing water (including ice caves). The most striking subterranean wetlands occur in cave and karst areas.
Karst is a three-dimensional, dynamic and integrated system of animals and plants, water, soils, landforms, bedrock, energy, water and gases. The drainage patterns and landforms are shaped by bedrock being dissolved by naturally acidic waters. Karst has underground drainage systems including caves, and distinctive surface features including blind valleys, closed depressions, sinking streams and springs.