Triangular space between clitoris and hymen -

Ref: synopsis of Forensic Medicine & Toxicology (K.S.Narayan Reddy)28th edition ,page 203 In a virgin female, the labia minora are two thin folds of skin just within the labia majora. The lower poions of labia mainora fuse in midline and form a fold fourchette. The depression between fourchette and vaginal orifice is called fosa navicularis. The clitoris is small and the triangular narrow space clitoris and hymen is called vestibule.