The kidneys are as important to your health as your heart and lungs. They rid the body of the waste that clogs it, control the amount of water and make hormones. We normally have two kidneys located on either side of the spine, at the height of the floating ribs. The kidneys are reddish brown in the shape of a bean the size of a closed fist. One of the main functions of the kidneys is to remove the waste from the blood and return the purified blood to the rest of the body.