Where are the kidneys located in the body?

The kidneys are located in the upper abdominal area, specifically in the retroperitoneal space, which is behind the peritoneum that lines the abdominal cavity. This positioning places them above the waistline, typically on either side of the spine, situated between the levels of the last thoracic vertebra (T12) and the third lumbar vertebra (L3).

The correct answer highlights the anatomical placement of the kidneys in relation to the body's landmarks. This positioning is significant for understanding various aspects related to kidney function, surgical approaches, and potential conditions that may affect the kidneys.