The Intestines are a long, continuous tube running from the stomach to the anus. Most absorption of nutrients and water happen in the intestines. The intestines include the Small Intestine, Large Intestine, and Rectum.
The Small Intestine (Small Bowel) is about 20 feet long and about an inch in diameter. Its job is to absorb most of the nutrients from what we eat and drink.
The Large Intestine (Colon or Large Bowel) is about 5 feet long and about 3 inches in diameter. The colon absorbs water from wastes, creating stool.