INTRODUCTION : The right internal jugular vein is commonly preferred for securing central venous access, and success of cannulation shows a positive correlation with veins diameter OBJECTIVE: The objective of our study is to establish the optimal position resulting in the largest RIJV diameter. METHODS: We conducted an observational study done on 100 volunteers and 2D USG was used to measure the lateral diameter of RIJV in different body positions, participants of either sex of age 18-60 years are included. RESULTS: All the 100 volunteers participated in this study. The RIJV was easy to visualize in all subjects.