Yemen is 4.7 times larger than Liberia.
Area: 111,369 km2 World Factbook
Population: 4,092,310 (July 2014) World Factbook
Liberia, officially the Republic of Liberia, is a country in West Africa bordered by Sierra Leone to its west, Guinea to its north and Ivory Coast to its east. It covers an area of 111,369 square kilometres and is home to about 4 million people. Wikipedia
Area: 527,968 km2 World Factbook
Population: 26,052,966 (July 2014) World Factbook
Yemen, officially known as the Republic of Yemen, is an Arab country in Western Asia, occupying the southwestern to southern end of the Arabian Peninsula. Yemen is the second largest country in the peninsula, occupying 527,970 km². The coastline stretches for about 2,000 km. Wikipedia