According to reflexologists, the kidney zone is nearly smack dab in the middle of the foot – and, rather conveniently, it's shaped like a kidney bean. But you don't need to know the exact outline of the kidney zone in order to effectively perform reflexology on the foot. It's in the same location on both feet.
To locate the area, first get into a position that allows you to comfortably view the bottom of the foot. Trace one finger down the underside of the middle toe and down to the center of the foot. Use another finger to find the center of the arch of the foot, then draw that finger across the foot. Where the two fingers meet is the kidney zone. It's small, only about the size of the top half of the thumb.