Pakistan is 12 times larger than Sri Lanka.
Area: 65,610 km2 World Factbook
Population: 21,866,445 (July 2014) World Factbook
Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, is an island country in the northern Indian Ocean off the southern coast of the Indian subcontinent in South Asia. Wikipedia
Area: 796,095 km2 World Factbook
Population: 196,174,380 (July 2014) World Factbook
Pakistan officially the Islamic Republic of Pakistan, is a sovereign country in South Asia. With a population exceeding 180 million people, it is the sixth most populous country and with an area covering 796,095 km², it is the 36th largest country in the world in terms of area. Wikipedia