The border is the Sino-Vietnamese border, where fighting broke out in March, 1979 between China and Vietnam, 4 years after the victory over South Vietnam and 4 months after the Vietnamese invasion of Cambodia. The Chinese were victorious but withdrew, and failed to stop the Cambodian incursion.
* The better known border is the Demilitarized Zone (DMZ) along the 38th Parallel separating North Korea from South Korea.
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Both parts of Vietnam were battle sites of the war.
The NVA and ARVN fought in South Vietnam. The only fighting taking place in North Vietnam was between jet aircraft (the air war).
The south
When the Vietnam War ended in 1975, North and South Vietnam became one communist nation called Vietnam.
Communist NORTH Vietnam wanted to re-unite with it's SOUTHERN half; SOUTH Vietnam. The US backed South Vietnam desired to remain a non-communist Republic of South Vietnam. Because the "Communists" were involved, and this was the cold war era; the US had to stop & contain communism. The North attacked the South, the South resisted...Vietnam War.