From the heights of plunging mountain vistas at the top of the world in northern Vietnam to the watery depths of the Mekong Delta in southern Vietnam, a tour through this long, skinny country is ever-changing. two areas stand out above all others: Sapa and the Mekong Delta. Unfortunately for the visitor with limited time, they are on opposite ends of the country, 1,270 miles (2,047 km) apart.