The large intestine is the last part of the digestive system in vertebrate animals. Its function is to absorb water from the remaining indigestible food matter, and then to pass useless waste material from the body.Terminologia Anatomic, Meds cape, and Gray's Anatomy define the large intestine as the combination of the cecum, colon, rectum, and anal canal. Other sources, such as Mosby's Medical Dictionary and the Oxford Dictionaries of Medicine and Biology exclude the anal canal. In humans, it begins in the right iliac region of the pelvis, just at or below the waist, where it is joined to the end of the small intestine. It then continues up the abdomen, across the width of the abdominal cavity, and then down to its endpoint at the anus. Overall, in humans, the large intestine is about 1.5 meters (4.9 ft) long, which is about one-fifth of the whole length of the intestinal canal.