Most dependent pa of abdomen in standing position is
The recto-uterine pouch (cul-de-sac or pouch of Douglas) is the extension of the peritoneal cavity between the rectum and the posterior wall of the uterus. It is the most inferior aspect of the peritoneal cavity and therefore the first location where free fluid accumulates . ref - BDC 6e vol2 pg244
Vesicouterine pouch
Pouch of douglas
Morrison pouch
Left paracolic gutter
Abdomen and pelvis