MONTW_120720_140
Existing comment: Swallet ... The opening through which a stream disappears underground:

Water from Montezuma Well flows through cracks in the limestone opening to your right, traveling underground for about 150 feet (46 meters). It emerges in an outlet which prehistoric farmers channeled into a canal to irrigate their crops. Water takes seven minutes to flow through this swallet and out to the canal. About 600 pounds of dissolved lime flows from the well through this swallet every day.
Modify description