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Before learning about colorectal cancer, it is important to know where the colon and rectum are located. The colon and rectum are at the lower end of the digestive system. The colon, a muscular tube about five feet long, absorbs fluid to form solid waste. The rectum, the last six inches of the digestive system, serves as a warehouse for this waste until it is pushed out of the body.
This is because the body has two intestines; a small intestine (small bowel) and a large intestine (large bowel). The body does not have two colons. The colon is only a portion of the large intestine, and there is only one colon in the body.