What geographic feature forms vietnam's western border?
mekong river
red river
alps
annam highlands

Mekong River

Explanation:

Vietnam's borders are areas covered by rivers, valleys and mountains. Most of the Western border, along with mountain ranges and dense forests, stretches the Mekong River and its delta. The interior is made up of valleys and hills with forests.

The most populated areas are those where agriculture is widespread.

consider an orange peel: if you want to try and lay it flat, you have to stretch it, we know exactly how things are being stretched or squashed at any given point. we have many different map projections because each has different patterns of some projections can even preserve certain features of the earth without