What was last stronghold in Vietnam war?

The last stronghold in the Vietnam War was the city of Saigon, the capital of South Vietnam. It fell to North Vietnamese forces on April 30, 1975, marking the end of the conflict and leading to the reunification of Vietnam under communist control. The fall of Saigon was a significant event, symbolizing the conclusion of U.S. involvement in Vietnam and the collapse of the South Vietnamese government.