Selangor (/səˈlæŋər/ sə-LANG-ər; Malay: [s(ə)laŋo(r)]),[6] also known by the Arabic honorific Darul Ehsan, or "Abode of Sincerity", is one of the 13 states of Malaysia.

According to local lore, a warrior who escaped from Malacca after the Portuguese conquest, took a break from his journey north and rested under a tree here.

[19] The Mao Kun map dating to the Ming dynasty and used by the Admiral Zheng He during his expeditions between 1405 and 1433 refers to places in Selangor such as the Klang River estuary (吉令港) and perhaps a hilly area.

[19] According to the Malay Annals, Tun Perak was appointed the chief of Klang during the reign of Muzaffar Shah.

Later, Paduka Sri Cina, the son of Mansur Shah and Hang Li Po was made raja of Jeram near Langat, which may be due to the presence of Chinese miners there.

In 1896, largely through the coordination of the Resident Frank Swettenham, Selangor united with Negeri Sembilan, Perak and Pahang to form the Federated Malay States, with Kuala Lumpur as its capital.

The state is bordered north by Bernam River from Perak, south by Sepang River from Negeri Sembilan, east and southeast by the Titiwangsa Mountains from Pahang and Negeri Sembilan and the Strait of Malacca on the west, and surrounds the Federal Territories of Kuala Lumpur and Putrajaya.

Being one of the most heavily urbanised regions in Malaysia and Southeast Asia, cities that make up Klang Valley include the state and royal capitals of Shah Alam and Klang, as well as the federal capital, Kuala Lumpur, which is strategically situated in the heart of the state.

It was then followed by the 1995 cession of Prang Besar of Sepang District to the federal government, which became what is now the nation's administrative and judicial capital Putrajaya.

Located in Kepong, FRIM promotes sustainable management and optimal use of forest resources in Malaysia by generating knowledge and technology through research, development and application in tropical forestry.

[44] The state also has an ecotourism centre, Paya Indah Wetlands, which is located in the district Kuala Langat near Dengkil.

Selangor's geographical position in the centre of Peninsular Malaysia contributed to the state's rapid development as Malaysia's transportation and industrial hub, creating jobs and attracting migrants from other states and from other Asian countries, especially Indonesia, the Philippines, Vietnam, Myanmar, Bangladesh, India, Pakistan and China.

[53] The traditional culture of Selangor's Malay majority is also influenced by those of Bugis, Minangkabau, Mandailing, Javanese, and Banjarese ancestry; most of whom are Muslims.

Selangor is the richest state in Malaysia in terms of gross domestic product (GDP) per capita (PPP).

[100][101][102] Commerce, industry and services are a major contributor to the economy of Selangor, accounting for over 58% of the state's GDP.

Several industrial sites produce electronic goods, chemicals and vehicles including Proton and Perodua cars.

[103][104][105] Imported vehicles from manufacturers including Toyota, Nissan, Volkswagen and BMW Motors are also assembled in the state.

[115] Agricultural activities of significance in the state include the establishment of palm oil and rubber plantation sites.

[120][better source needed] Tourist attractions in Selangor include the I-City in Shah Alam, a retail and commercial hub with millions of LED lights and an indoor park;[121] the National Zoo of Malaysia (Zoo Negara) in Ampang Jaya, the largest zoo in Malaysia with more than 4,000 animals;[122] Sepang International Circuit in Sepang, the venue for the Formula One Malaysian Grand Prix, the A1 Grand Prix and the Malaysian Motorcycle Grand Prix;[123] the Sultan Salahuddin Abdul Aziz Shah Mosque;[124] Wat Chetawan and Sunway Lagoon in Bandar Sunway, Malaysia's top theme park.

While most of the businesses are genuine, some brothels masquerade as massage parlours and spas; the Royal Malaysian Police frequently raid such establishments when they receive tip-offs from the public.

[130][131] Selangor also has the domestic Subang Airport, which is a major hub for corporate and private aviation in south-east Asia.

[113] Paid bus routes in Kuala Lumpur connect Klang Sentral in Klang,[134] Kompleks Perhentian Kajang in Kajang,[135] One Utama Bus Transportation Hub in Petaling Jaya,[136] and Terminal Seksyen 13 in Shah Alam to other states in Malaysia.

Rapid Bus, operated by Rapid KL, offered services in Klang Valley area, namely Subang Jaya, USJ, Puchong, Petaling Jaya, Shah Alam, and Klang south of the Federal Highway and Area Six, which covers Damansara, Bandar Utama, Kota Damansara and areas of Petaling Jaya, Shah Alam, and Klang north of the Federal Highway.

[138] The services was introduced on 23 September 2006 when Rapid KL decided to revamp the Klang Valley bus network.

[143] It is linked to other rail transit services at KL Sentral Station, a modern transportation hub in the city centre.

The first MRT line covers a span of 46 kilometres from Kwasa Damansara to Kajang, passing the Kuala Lumpur city centre where the alignment goes underground.

The line will be serving a corridor with 1.2 million residents within the Klang Valley region from north-west to the south-east of Kuala Lumpur.

The line continues in twin-bore tunnels to the Maluri portal, passing through the city centre and the Golden Triangle of Kuala Lumpur.

Interchange to other lines is provided from Muzium Negara to Maluri with the exception of Cochrane in the Kuala Lumpur city.

The line will stretch from Sungai Buloh to Putrajaya and will include densely populated areas Sri Damansara, Kepong, Batu, Jalan Sultan Azlan Shah, Jalan Tun Razak, KLCC, Tun Razak Exchange, Kuchai Lama, Seri Kembangan, and Cyberjaya.