It starts right at the bottom edge of my rib cage, and about 1 inch in from my side, then it stops right when it gets to my belly button
. It moves around easily, and it feels smooth not bumpy, but it is very hard, and is just smaller than the size of both of my fists put together side to side. I have had no pain, tenderness, or any kind of stomach upset or indigestion at all. I am female, only 23, and am 5'9" 120 pounds.