Vietnam, with a total area exceeding 331,000 square kilometers and a coastline of approximately 3,444 kilometers, experiences significant constriction in its territorial shape in certain areas. Notably, the country’s landmass narrows to a mere 50 kilometers at its most slender point. This geographical characteristic highlights the unique topography of Vietnam. The precise province where this narrowest section occurs has been a subject of interest. This emphasizes the diversity of Vietnam’s landscape, despite its overall large area. Understanding these geographical features provides context to Vietnam's development and regional dynamics.