Which region of the US is covered with flat grassy lands?
What region has flat lands that gradually increase in elevation westward and is covered in dry grasslands?
Generally speaking, Vietnam is a mountainous and hilly country. However, in the Mekong River Delta region (near to and south of Saigon) and, to a lesser extent, in the Red River Delta region (near to and southwest of Hanoi), there are relatively flat and low-elevation regions. This is the exception, not the rule.