A point at which a surface stream disappears underground; may be empty into a collapse feature, cave feature such as shaft or be the gradual downward percolation through streambed gravels or boulders. Cf. swallet. Found on http://www.cancaver.ca/docs/glossary.htm
A point at which a surface stream disappears underground; may be empty into a collapse feature, cave feature such as shaft or be the gradual downward percolation through streambed gravels or boulders. Cf. swallet.