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Peninsular Malaysia (Malay: Semenanjung Malaysia), also known as West Malaysia (formerly Malaya), is the part of Malaysia which lies on the Malay Peninsula. Its area is 131,598 square kilometres (50,810 sq mi). It shares a land border with Thailand in the north. To the south is the island of Singapore. Across the Strait of Malacca to the west lies the island of Sumatra (Indonesia). East Malaysia (on the island of Borneo) is to the east across the South China Sea. As of 2012, its population is roughly 23.5 million, Peninsular Malaysia accounts for the majority (roughly 80%) of Malaysia's population and economy.
States and territories 
Peninsular Malaysia consists of the following 11 states and two federal territories (starting from the North going to the South):
- Northern Region: Perlis, Kedah, Penang, Perak
- East Coast Region: Kelantan, Terengganu, Pahang
- Central Region: Selangor, federal territories of Kuala Lumpur and Putrajaya
- Southern Region: Negeri Sembilan, Malacca, Johor
Origin of name 
The name "Malaysia" was vaguely used in the 19th century by some British colonists as an alternative name describing the Malay Archipelago. In 1963, the name was adopted by the new federation uniting the Federation of Malaya, Sabah, Sarawak and Singapore. At the time, the Philippines had been contemplating adopting the name as well.
Peninsular Malaysia is also known as West Malaysia (Malaysia Barat) or Malaya (Tanah Melayu). The term "Peninsular Malaysia" is used more often than "West Malaysia" (to avoid the idea that West and East Malaysia are separate countries like West Germany and East Germany used to be until 1990), or "Malaya" (which is now becoming obsolete due to its connotations of the British colonial era).
Nonetheless, all three terms are correct, and the older term "Malaya" can still be found in many institutional titles, e.g. the High Court of Malaya, the University of Malaya, Malayan Railway, etc., as well as in legal contexts in the phrase the "States of Malaya" (Negeri-negeri Tanah Melayu), which should not be confused with the Malay states. In current everyday usage the word Malaya is almost always used jocularly, e.g. "Gempar satu Malaya!" which roughly means "(This news) shakes the whole of Malaya!"
Until 1946, and for some time afterwards, the term Malaya included Singapore. In Singaporean law, the term "Malaya" includes Singapore, but the term "States of Malaya" does not.
Other features 
East Coast and West Coast 
The term East Coast is particularly used in Malaysia to describe the following states in Peninsular Malaysia facing the South China Sea:
The term West Coast refers informally to a collection of states in Peninsular Malaysia situated towards the western coast generally facing the Strait of Malacca, as opposed to the East Coast. Unlike the East Coast, the West Coast is partitioned further into three regions (as seen in #States and territories), including:
- The Northern Region: Perlis, Kedah, Penang and Perak.
- The Central Region: Selangor and the federal territories of Kuala Lumpur and Putrajaya.
- The Southern Region: Negeri Sembilan, Malacca and Johor.
Even though Johor has a coastline facing the South China Sea, it is not generally regarded as an East Coast state.
West and East Malaysia 
The distinction between West and East Malaysia (Sabah and Sarawak) is significant beyond the sphere of geography, because as well as having a different court structure, the eastern states have more autonomy than the original States of Malaya, for example, maintaining restrictions on immigration from the peninsula.
See also 
- Peninsular Malaysia travel guide from Wikivoyage