Sri Lanka is 11 times larger than Brunei.
Area: 5,765 km2 World Factbook
Population: 422,675 (July 2014) World Factbook
Brunei, broo-NY or broo-NAY; officially the Nation of Brunei, the Abode of Peace, is a sovereign state located on the north coast of the island of Borneo in Southeast Asia. Wikipedia
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