The placental location and the boundaries of the placenta were established by two‐dimensional ultrasound examination in 107 cases. In 45 of them, the result of the ultrasound placentography was correlated with the finding at Caesarean section. The reliability of this ultrasound method was 95.6%, a figure comparable with those produced by other techniques. The technique of ultrasound placentography is simple, the method does not cause any discomfort for the patient and is harmless to mother and child.