Van Ophuijsen Spelling System in the context of "State of East Indonesia"

Aceh (/ˈɑːtʃeɪ/ AH-chay, Indonesian: [ˈatʃɛh] ; Acehnese: Acèh, Acehnese pronunciation: [atʃɛh]; Jawoë: اچيه; Old Spelling: Atjeh) is the westernmost province of Indonesia. It is located on the northern end of Sumatra island, with Banda Aceh being its capital and largest city. It is bordered by the Indian Ocean to the west, Strait of Malacca to the northeast, as well bordering the province of North Sumatra to the east, its sole land border, and shares maritime borders with Malaysia and Thailand to the east, and Andaman and Nicobar Islands of India to the north. Granted a special autonomous status, Aceh is a religiously conservative territory, with the majority of the population being Muslim and the only Indonesian province practicing Islamic Sharia law officially. There are ten indigenous ethnic groups in this region, the largest being the Acehnese people, accounting for approximately 70% of the region's population of about 5.55 million people in mid-2024. Its land area of 56,839.09 km is comparable to Croatia, Togo, the U.S. state of West Virginia, or Russia's Pskov Oblast.

Aceh is a provincial region that constitutes a unified legal community with a special status and is granted special authorities to regulate and manage its own governmental affairs and local interests in accordance with laws and regulations within the system and principles of the Unitary State of the Republic of Indonesia, based on the 1945 Constitution of the Republic of Indonesia, and is led by a Governor.

The Youth Pledge (Indonesian: Sumpah Pemuda, lit. 'Youth Oath'), officially titled as Decision of the Congress of Indonesian Youth (van Ophuijsen spelling Indonesian: Poetoesan Congres Pemoeda-pemoeda Indonesia) is the nationalist pledge made by young Indonesians on 28 October 1928, which defined the identity of Indonesians. The decision proclaimed three ideas: one motherland, one nation, and a unifying language.

The Dayak (/ˈdaɪ.ək/ ; older spelling: Dajak), Dyak, Dayuh or Dayaknese, are the Austronesian ethnic groups native of Borneo. It is a loose term for over 200 riverine and hill-dwelling ethnic groups, located principally in the central and southern interior of Borneo, each with its own dialect, customs, laws, territory, and culture, although common distinguishing traits are readily identifiable. The Dayak were animist (Kaharingan and Folk Hindus) in belief; however, since the 19th century there has been mass conversion to Christianity and to Islam.

The Kapuas River (Old Indonesian spelling: Kapoeas River) is a river in the Indonesian part of Borneo island, at the geographic center of Maritime Southeast Asia. At 1,143 km (710 mi) in length, it is the longest river on the island of Borneo, the longest river in Indonesia and one of the world's longest island rivers. It originates in the Müller mountain range at the center of the island and flows west into the South China Sea creating an extended marshy delta. The delta is located west-southwest of Pontianak, the capital of the West Kalimantan province. This Kapuas River should be distinguished from another Kapuas, which starts on the other side of the same mountain range in central Borneo but flows to the south, merging with the Barito and discharging into the Java Sea.

Sudirman (Old Spelling: Soedirman; 24 January 1916 – 29 January 1950) was an Indonesian military officer and revolutionary during the Indonesian National Revolution and the first commander of the Indonesian National Armed Forces.

Born in Purbalingga, Dutch East Indies, Sudirman moved to Cilacap in 1916 and was raised by his uncle. A diligent student at a Muhammadiyah-run school, he became respected within the community for his devotion to Islam. After dropping out of teacher's college, in 1936 he began working as a teacher, and later headmaster, at a Muhammadiyah-run elementary school. After the Japanese occupied the Indies in 1942, Sudirman continued to teach, before joining the Japanese-sponsored Defenders of the Homeland (PETA) as a battalion commander in Banyumas in 1944. In this position he put down a rebellion by his fellow soldiers, but was later interned in Bogor. After Indonesia proclaimed its independence on 17 August 1945, Sudirman led a break-out then went to Jakarta to meet President Sukarno. Tasked with overseeing the surrender of Japanese soldiers in Banyumas, he established a Division of the People's Safety Body there. On 12 November 1945, at an election to decide the military's commander-in-chief in Yogyakarta, Sudirman was chosen over Oerip Soemohardjo in a Close vote. While waiting to be confirmed, Sudirman ordered an assault on British and Dutch forces in Ambarawa. The ensuing battle and British withdrawal strengthened Sudirman's popular support, and he was ultimately confirmed on 18 December.

Gresik Regency (older spelling: Grissee, Javanese: ꦒꦽꦱꦶꦏ꧀, romanized: Grêsik) is a regency within East Java Province of Indonesia. As well as a large part of the northern and western suburbs of the city of Surabaya, it includes the offshore Bawean Island, some 125 km to the north of Java and Madura. Almost a third of the Gresik Regency's area is the coastal area; the Districts in this zone are Kebomas District, (part of) Gresik District, Manyar District, Bungah District, and Ujungpangkah District.

The regency covers and an area of 1,191.26 km, and it had a population of 1,177,042 at the 2010 Census and 1,311,215 at the 2020 Census; the official estimate as at mid 2024 was 1,327,497 (comprising 667,540 males and 659,957 females). The regency's administrative centre is the town of Gresik, about 25 km to the northwest of Surabaya. Gresik Regency (excluding Bawean Island) is also part of Gerbangkertosusila, the metropolitan region of Surabaya.

The Principality of Pakualaman (also written Paku Alaman; Dutch-spelling: Pakoe-alaman) is a minor Javanese princely state within the Sultanate of Yogyakarta. It was created in 1812 when Natakusuma (later Prince Paku Alam I) was rewarded for helping the British quell the conflict in Yogyakarta in June 1812. It became the mirror image of Mangkunegaran in the territory of the Surakarta Sunanate.

A Pakualaman Corps of 100 cavalry (later 50 cavalry and 100 infantry) was established, but was never to become as significant as the Mangkunegaran Legion, and disbanded in 1892. Due to Paku Alam VIII's role in the Indonesian independence movement, a law was passed to allow the position of vice-governor of the Yogyakarta Special Region to be filled hereditarily by the reigning Prince Paku Alam at any particular time, while the Sultans of Yogyakarta fills the role of Governor on a hereditary basis.