Although the prostate may be out of site, it should not be out of mind. Men have a gland, which is located underneath the bladder and just above the rectum, called the prostate gland. It is said to be approximately the size of a small plum or somewhat bigger than a walnut. The prostate gland, shaped like a donut, encases a part of the urethra. The urethra is the canal that carries the urine and the semen to the exterior opening of the penis.