Vietnam is approximately 331,210 sq km, while Comoros is approximately 2,235 sq km, making Comoros 0.67% the size of Vietnam. Meanwhile, the population of Vietnam is ~98.7 million people (97.9 million fewer people live in Comoros).
This to-scale map shows a size comparison of Vietnam compared to Comoros. For more details, see an in-depth quality of life comparison of Comoros vs. Vietnam using our country comparison tool.