Until recently few people considered the presence of cliff wetlands but their conservation as wetlands is gaining acceptance. Two major classes of cliff wetlands occur in Tennessee: seepage cliffs and spray cliffs. Spray cliffs are associated with waterfalls in mountainous terrains that generally have a strong flow. In these environments water spray from the waterfall keeps the nearby cliff faces constantly wet. On the other hand, seepage cliffs, are kept wet by groundwater seepage from upslope flowing or trickling (seeping) downslope over the cliff face.