What cavity are the kidneys aorta urethra and inferior vena cava located?

The kidneys, aorta, urethra, and inferior vena cava are located in the abdominal cavity. Specifically, the kidneys are situated in the retroperitoneal space, which is behind the peritoneum that lines the abdominal cavity. The aorta and inferior vena cava run along the posterior abdominal wall, while the urethra extends from the bladder to the external body.