Vietnam is approximately 331,210 sq km, while South Africa is approximately 1,219,090 sq km, making South Africa 268% larger than Vietnam. Meanwhile, the population of Vietnam is ~98.7 million people (42.3 million fewer people live in South Africa).
This to-scale map shows a size comparison of Vietnam compared to South Africa. For more details, see an in-depth quality of life comparison of South Africa vs. Vietnam using our country comparison tool.