Reflexology or Zone Therapy works mainly on reflecting areas or anatomical correspondences we might call them. It can be done all over the body but nowadays mostly on the feet.
The hands, ears, face and other areas also have holographic reflecting areas and there are reflexology charts for these areas and other body areas readily obtainable.
Nowadays the meridian system is often thrown in with the reflex areas approach, giving us a mixture of reflexology and acupressure, and why not as this is also the traditional Chinese medicine approach to it.