Saudi Arabia is 13 times larger than Tunisia.
Area: 2,149,690 km2 World Factbook
Population: 27,345,986 (July 2014) World Factbook
Saudi Arabia, officially known as the Kingdom of Saudi Arabia, is the largest Arab state in Western Asia by land area and the second-largest in the Arab world after Algeria. Wikipedia
Area: 163,610 km2 World Factbook
Population: 10,937,521 (July 2014) World Factbook
Tunisia, officially the Tunisian Republic; is the northernmost country in Africa and, at almost 165,000 square kilometres in area, the smallest country in the Maghreb region of North Africa. Wikipedia