Dongguan (China) is 3.5 times larger than Singapore.
Area: 697 km2 World Factbook
Population: 5,567,301 (July 2014) World Factbook
Singapore, officially the Republic of Singapore, is a sovereign city-state and island country in Southeast Asia. It lies off the southern tip of the Malay Peninsula and is 137 kilometres north of the equator. Wikipedia
Area: 2,456 km2 calculated
Dongguan is a prefecture-level city in central Guangdong province, People's Republic of China. Wikipedia