In humans, fertilization usually occurs at:

During copulation, semen is released by the penis into the vagina. The motile sperms swim rapidly and enter the uterus. Finally, they reach the ampullary region of the fallopian tube. The ovum is also transported to the ampullary region where fertilization occurs. Fertilization happens only when the ovum and sperms are transported simultaneously to the ampullary region of the fallopian tube.