Kidney looks like a bean seed. Its outer side is convex and inner side is concave. Below the ribcage in the lumbar region of the abdominal cavity are two kidneys on either side of the spine. The left kidney is slightly larger than the right kidney. The upper edge of the kidney lies below the 12th thoracic vertebra and is protected by the 11th and 12th vertebrae. The lower edge of the kidney lies above the third lumbar vertebra. The left kidney lies slightly above the liver and the right kidney slightly below.