Thailand is 2.8 times larger than Cambodia.
Area: 181,035 km2 World Factbook
Population: 15,458,332 (July 2014) World Factbook
Cambodia, officially known as the Kingdom of Cambodia and once known as the Khmer Empire, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. Wikipedia
Area: 513,120 km2 World Factbook
Population: 67,741,401 (July 2014) World Factbook
Thailand, officially the Kingdom of Thailand, formerly known as Siam, is a country at the centre of the Indochina peninsula in Southeast Asia. Wikipedia