Exact population: 408,786 (July 2011 est.) Literacy: Total population: 93.9%; male: 96.3%; female: 91.4% Ethnicities: Malay 67%, Chinese 15%, indigenous 6%, other 12% Land boundaries: Total: 381 km; border countries: Malaysia 381 km Terrain: Flat coastal plain rises to mountains in east; hilly lowland in west Extremes: Lowest point: South China Sea 0 m; highest point: Bukit Pagon 1,850 m Imports: Singapore 32.7%, Malaysia 21.2%, UK 8.3%, Japan 7.2% (2004) Exports: Japan 38.1%, South Korea 14%, Australia 11.2%, US 8.6%, Thailand 7.9%, Indonesia 5.9%, China 4.5% (2004) Industries: Petroleum, petroleum refining, liquefied natural gas, construction