Central Kalimantan in the context of "West Kalimantan"

Kalimantan (Indonesian pronunciation: [kaliˈmantan]) is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area, and consists of the provinces of Central Kalimantan, East Kalimantan, North Kalimantan, South Kalimantan, and West Kalimantan. The non-Indonesian parts of Borneo are Brunei and East Malaysia. In Indonesia the whole island of Borneo is also called "Kalimantan".

In 2019, President of Indonesia Joko Widodo proposed that Indonesia's capital be moved to Kalimantan. The People's Consultative Assembly approved the Law on State Capital in January 2022. The future capital, Nusantara, is a planned city that will be carved out of East Kalimantan. A government official said construction is expected to be fully complete by 2045, but the unfinished capital officially celebrated Indonesian Independence Day for the first time and it was scheduled to be inaugurated as the capital city on 17 August 2024, but the move did not take place due to delays of construction.

Banjarese (/ˈbændʒəˌriːz/ BAN-juh-reez; Basa Banjar, Jaku Banjar, Jawi script: باس بنجر‎ IPA: [basa bandʒar], [dʒaku bandʒar]) or simply Banjar, is an Austronesian language of the Malayic branch predominantly spoken by the Banjarese—an indigenous ethnic group native to Banjar regions— in the southeastern Kalimantan of Indonesia. The Banjarese language is the de facto lingua franca for various indigenous community especially in South Kalimantan, as well as Central Kalimantan (notably in Seruyan Regency and Sukamara Regency) and East Kalimantan in general.

Banjarese also has significant population in other provinces in Indonesia, especially in Sumatra (Riau and North Sumatra) even some regencies in Riau has a Banjarese majority population like in Indragiri Hilir Regency.

East Kalimantan (Indonesian: Kalimantan Timur) is a province of Indonesia. Its territory comprises the eastern portion of Borneo/Kalimantan. It had a population of about 3.03 million at the 2010 census (within the present boundary), and 3.766 million at the 2020 census; the official estimate as at mid 2024 was 4,092,984. Its capital is the city of Samarinda, the most populous city on the entire island of Borneo.

East Kalimantan has a total area of 127,346.92 square kilometres (49,168.92 sq mi) and is the third least densely populated province in Kalimantan (after North Kalimantan and Central Kalimantan). The majority of the region shares a maritime border to the east with West Sulawesi and Central Sulawesi; its Cape Mangkalihat separates the Makassar Strait from the Celebes Sea. Its former northernmost region was split off on 25 October 2012 and is now the separate province of North Kalimantan; meanwhile it still shares land border to the west with West Kalimantan and Central Kalimantan; to its south, East Kalimantan borders South Kalimantan. The province bordered Sabah, Malaysia before the creation of North Kalimantan, and still has a short border with Sarawak, Malaysia through Mahakam Ulu Regency.

The Republic of Indonesia, a country located in Southeast Asia has three time zones. Western Indonesia Time (Waktu Indonesia Barat, WIB) is seven hours ahead (UTC+07:00) of the Coordinated Universal Time (UTC), used in the islands of Sumatra, Java, and the western half of Kalimantan. Central Indonesia Time (Waktu Indonesia Tengah, WITA) is eight hours ahead (UTC+08:00), used in the eastern half of Kalimantan, as well as all of Bali, the Lesser Sunda Islands, and Sulawesi. Eastern Indonesia Time (Waktu Indonesia Timur, WIT) is nine hours ahead (UTC+09:00), used in the Maluku Islands and Western New Guinea. About 80% of the Indonesian population live in WIB (UTC+07:00).

In 1908, during the Dutch East Indies colonial era, only Java and the Madura Island were initially given time until 1932, when the government utilised UTC+06:30 up to +09:30. In between those changes in 1918, Central Java (UTC+07:20, now defunct) was the basis for time in select locations: for instance, Padang was 7 minutes behind Central Java. The Japanese occupation of the Indies prompted the simplification of time in Indonesia to just UTC+09:00, also known as the Japan Standard Time. The Dutch reoccupied the country following its 1945 independence with UTC+06:00 up to +09:00 established, but it was reverted to the 1932 system after they recognised Indonesia's sovereignty. The current time zone division is a 1988 revision of a 1964 division, with Bali, West Kalimantan, and Central Kalimantan changing sides. Without any significant season changes, the daylight saving time system is not observed anywhere in Indonesia, as is other Southeast Asian countries.

The Banjarese (Banjar: Urang Banjar, Jawi script: اورڠ بنجر; Indonesian: Orang Banjar) or simply Banjar, are an Austronesian ethnic group native to the Banjar regions (notably Banjarmasin, Banjarbaru, Banjar Regency, etc.) in the southeastern Kalimantan regions of Indonesia. Nowadays, Banjarese diaspora can be found in neighbouring Banjar regions as well; including Kotabaru Regency, the southeastern regions of Central Kalimantan, southernmost regions of East Kalimantan, and some provinces of Indonesia in general. The Banjarese diaspora community also can be found in neighbouring countries of Indonesia, such as Brunei, Malaysia (notably in Perak, Selangor, Kedah and Johor with significant minorities in Sabah), and Singapore.

South Kalimantan (Indonesian: Kalimantan Selatan) is a province of Indonesia. It is the smallest in land area but the second most populous province on the island of Kalimantan, the Indonesian territory of the island of Borneo after West Kalimantan. The provincial capital was Banjarmasin until 15 February 2022, when it was legally moved 35 kms southeast to Banjarbaru. The population of South Kalimantan was recorded at just over 3.625 million people at the 2010 Census, and at 4.07 million at the 2020 Census. The official estimate as at mid 2024 was 4,293,515.

One of the five Indonesian provinces in Kalimantan, it is bordered by the Makassar Strait in the east, Central Kalimantan in the west and north, the Java Sea in the south, and East Kalimantan in the northeast. The province also includes the island of Pulau Laut ("Sea Island"), located off the eastern coast of Kalimantan, as well as other smaller offshore islands. The province is divided into 11 regencies and 2 cities. South Kalimantan is the traditional homeland of the Banjar people, although some parts of East Kalimantan and Central Kalimantan are also included in this criterion. Nevertheless, South Kalimantan, especially the former capital city Banjarmasin has always been the cultural capital of Banjarese culture. Many Banjarese have migrated to other parts of Indonesia, as well as neighbouring countries such as Singapore and Malaysia. In addition, other ethnic groups also inhabit the province, such as several groups of the Dayaks, who mostly live in the interior part of the province, as well as the Javanese, who mostly migrated from Java due to the Transmigration program which dated from the Dutch colonial era. It is one of the provinces in Indonesia that has a larger population than Mongolia.