Abdominal cavity is inferior to the diaphragm.
Diaphragm
No, the diaphragm lies superior to the organs in the thoracic cavity. It is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity and plays a key role in the process of respiration.
The inferior boundary of the thoracic cavity is formed by the diaphragm, which is a dome-shaped muscle located below the lungs and separates the thoracic cavity from the abdominal cavity.
Inferior
Body cavities located inferior to the diaphragm include the abdominal cavity and the pelvic cavity. The abdominal cavity houses organs such as the stomach, liver, and intestines, while the pelvic cavity contains the reproductive organs, bladder, and rectum.
Inferior mainly, then lateral and interior to some structures.
The kidneys are in the retroperitoneal space, located inferior to the diaphragm, lateral to the vertebral column, and deep to the peritoneal cavity.
Thoracic cavity indicates your chest , the Abdominal cavity indicates your abdomen INFERIOR means under .Your chest is above your abdomen hence the thoracic cavity is SUPERIOR to the Abdominopelvic cavity.
In terms of body regions, the abdomen is inferior to the diaphragm. In terms of body cavities, the abdominopelvic cavity is inferior to the diaphragm. In terms of anatomical regions of the body, the umbilical region is the inferior to the epigastric region (which the diaphragm is found in)
The diaphragm is located underneath the ribcage and separates the chest cavity from the abdominal cavity. It contracts and relaxes to help regulate breathing by controlling the volume of the chest cavity.
Diaphragm is a sheet of internal skeletal muscle that extends across the bottom of the rib cage. The diaphragm separates the thoracic cavity (heart, lungs & ribs) from the abdominal cavity and performs an important function in respiration: as the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs.
Your question is not clear, but the diaphragm is the muscle that divided the abdomen from the thorax (the chest cavity from the abdominal cavity). Ventral is term that is used mostly in veterinary medicine and it refers to the side of the body that has the belly button.