Banjar Regency is one of the eleven regencies in the Indonesian province of South Kalimantan; the capital is Martapura. It covers an area of 4,668.5 km2, and had a population of 506,839 at the 2010 Census, and 565,635 at the 2020 Census; the official estimate as at mid 2023 was 575,115. It lies immediately to the east of the city of Banjarmasin and north of the city of Banjarbaru, which it surrounds on the latter's west, north and east sides; the regency capital of Martapura is immediately north of Banjarbaru, of which it is effectively an extension. This regency is noted for its diamond mines and its people's religiosity. Motto: "Barakat" (Banjarese:"Blessing").

South Kalimantan is a province of Indonesia. It is the smallest province in Kalimantan, the Indonesian territory of the island of Borneo. The provincial capital was Banjarmasin until 15 February 2022 when it was legally moved 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 2023 was 4,221,929. 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, 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.