Malaysia consists of two parts: West Malaysia, also called Peninsular Malaysia or Malaya (1990 est. pop. 14,400,000), 50,700 sq mi (131,313 sq km), on the Malay Peninsula and coextensive with the former Federation of Malaya, comprising the states of Perlis, Kedah, Pinang, Perak, Kelantan, Terengganu, Pahang, Selangor, Negeri Sembilan, Melaka (Malacca), and Johor, and two federal territories (the cities of Kuala Lumpur and Putrajaya); and East Malaysia (1990 est. pop. 3,410,000), 77,730 sq mi (201,320 sq km), comprising the states of Sabah and Sarawak (the former British colonies of North Borneo and Northwest Borneo) on the island of Borneo and one federal territory, the island of Labuan. The two parts are separated by c.400 mi (640 km) of the South China Sea.
West Malaysia is bordered on the north by Thailand, on the east by the South China Sea, on the south by Singapore (separated by the narrow Johore Strait), and on the west by the Strait of Malacca and the Andaman Sea. East Malaysia is bordered on the north by the South China Sea and the Sulu Sea, on the east by the Celebes Sea, and on the south and west by Kalimantan (Indonesian Borneo). Along the coast within Sarawak is the independent nation of Brunei. Both East and West Malaysia have mountainous interiors and coastal plains. The highest point is Mt. Kinabalu (13,455 ft/4,101 m) in Sabah. The longest of the country's many rivers are the Rajang (c.350 mi/560 km) in Sarawak, the Kinabatangan (c.350 mi/560 km) in Sabah, and the Pahang (c.200 mi/320 km) in West Malaysia. Lying close to the equator, Malaysia has a tropical rainy climate. Over two thirds of the land area is forested.
Although it makes up only 31% of the country's area, West Malaysia has more than 80% of its people. Of the total population, most of which is concentrated on the west coast, some 50% are ethnically Malay, almost 25% are Chinese, over 10% are of indigenous descent, and about 7% are South Asian (mainly Tamil). In West Malaysia, Malays comprise about one half of the population, Chinese one third, and South Asians one tenth. In East Malaysia, the two largest groups are the Chinese and the Ibans (Sea Dyaks), an indigenous people, who together make up about three fifths of the total. Conflict between the ethnic groups, particularly between Malays and Chinese, has played a large role in Malaysian history, and recent years have seen increased tension between ethnic Malays and people of South Asian descent.
Nearly all of the Malays are Sunni Muslims (they are considered to be Muslim under the constitution), and Islam is the national religion. The majority of Chinese are Buddhists (Confucianism and Taoism are also practiced), and most of the South Asians are Hindu; 9% of the population is Christian. The official language is Bahasa Malaysia (Malay), although English is used in the legal system. Chinese (Cantonese, Mandarin, and other dialects), Tamil, and regional ethnic languages and dialects are also widely spoken.