I believe Vietnam was in Korea.
There are trees and grass.
Jungle (heavily forested) is the terrain, like snow, mountains, or the desert (even the ocean is terrain, such as a naval war). You might mean "guerrilla warfare." From 1955 thru 1964 was guerrilla warfare restricted to South Vietnam. From the Tonkin Gulf incident (August '64) onward commenced conventional warfare against North Vietnam.
Legends says that US used Extensive Helicopters to deploy its soldiers in tough terrain of Vietnam.
they like a flat terrain like a platue
What is the terrain of mesopotamia
The Vietnam War did not succeed because of the terrain they were fighting in. Another over whelming factor was the restrictions that were put on the military to use their full capability to end the war by politicians
The terrain was gentle swelling hills
dirt
its like mountains
See website: Vietnam
Hell