Johor (/dʒəˈhɔːr/; Malay pronunciation: [d͡ʒoho(r)]), also spelled as Johore, is a state of Malaysia in the south of the Malay Peninsula. Johor has land borders with the Malaysian states of Pahang to the north and Malacca and Negeri Sembilan to the northwest. Johor shares maritime borders with Singapore to the south and Indonesia to both the west and east. Johor Bahru is the capital city and the economic centre of the state, Kota Iskandar is the seat of the state government, and Muar serves as the royal town of the state. The old state capital is Johor Lama. As of 2020, the state's population is 4.01 million, making it the second most populated state in Malaysia. Johor has highly diverse tropical rainforests and an equatorial climate. The state's mountain ranges form part of the Titiwangsa Range, which is part of the larger Tenasserim Range connected to Thailand and Myanmar, with Mount Ophir being the highest point in Johor. While its state capital, Johor Bahru, which is located within Iskandar Malaysia development corridor, is one of the most densely populated and fastest-growing urban areas in Malaysia. Johor has high diversity in ethnicity, culture, and language. The state is known for its traditional dance of zapin and Kuda kepang. The head of state is the Sultan of Johor, while the head of government is the Menteri Besar. The government system is closely modelled on the Westminster parliamentary system, with the state administration divided into administrative districts. Islam is the state religion per the 1895 Constitution of Johor, but other religions can be freely practised. Both Malay and English have been accepted as official languages for the state since 1914. The economy is mainly based on services and manufacturing sectors. Johor is one of the main economic powerhouses in Malaysia and is currently among the top 4 contributors to the national gross domestic product, along with Selangor, Kuala Lumpur and Sarawak. It is also one of the most vital international trade centres in Malaysia, with Port of Tanjung Pelepas being the 15th busiest port in the world, as well as the busiest container port in the nation.