Punch Bowl Spring
In Upper Geyser Basin a giant crater-like formation looks like a natural oversized punch bowl. The raised rim is not a crater though, it is a sinter formation made by the mineral deposits left form the water that boils up. The trail begins 1/10 a mile south of Grotto Geyser. As with any protected area, stay on the boardwalks or trails for your own protection and to preserve the area for other visitors.