Wyoming’s Periodic Spring is well-named. It flows for roughly 15 minutes, then goes dry for 15 minutes, then repeats again. It is the world’s largest intermittent spring, or rhythmic spring, or breathing spring. This is likely caused by an oddly-shaped cavern fed by spring water in the rock behind the spring.
There’s only about 100 known intermittent springs in the world. Another famous one is in Jerusalem! Although it no longer runs intermittently naturally, and a pump is used to imitate it.
