Samerchua A, Kongwatmai K, Boonsri S, et al. - The present study was conducted to compare the accuracy, agreement, and reliability of the external anatomical landmark and the radiological landmark, confirmation being by transesophageal echocardiography. Researchers performed a prospective observational study of children ages 1‐15 years. At the superior vena cava, catheter was placed and the right atrium junction guided by transesophageal echocardiography. There were 15 individuals who included in the study (median age of 3 years). The results of this study showed that both the external anatomical landmark and the radiological landmark enabled accurate calculation of the central venous catheter depth close to the superior vena cava and the right atrium junction. Compared with the radiological landmark, the external anatomical landmark is of more potential use in clinical practice.