Yogyakarta (city) in the context of "K.P.H. Notoprojo"

Mount Merapi (Indonesian: Gunung Merapi; Javanese: ꦒꦸꦤꦸꦁ​ꦩꦼꦫꦥꦶ, romanized: gunung měrapi, lit. 'Fire Mountain') is an active stratovolcano located on the border between the province of Central Java and the Special Region of Yogyakarta, Indonesia. It is the most active volcano in Indonesia and has erupted regularly since 1548. It is located approximately 28 km (17 mi) north of Yogyakarta city which has a population of 2.4 million. Thousands of people live on the flanks of the volcano, with villages as high as 1,700 m (5,577 ft) above sea level.

Smoke can often be seen rising from the mountaintop, and several eruptions have caused fatalities. A pyroclastic flow from a large explosion killed 27 people on 22 November 1994, mostly in the town of Muntilan, west of the volcano. Another large eruption occurred in 2006, shortly before the Yogyakarta earthquake. In light of the hazards that Merapi poses to populated areas, it was designated as one of the Decade Volcanoes, which are considered worthy of particular study in light of their history of large, destructive eruptions and proximity to densely populated areas.

Magelang (Javanese: ꦩꦒꦼꦭꦁ) is one of six cities in Central Java, Indonesia, that are administratively independent of the regencies in which they lie geographically. Each of these cities is governed by a mayor rather than a bupati. Magelang City covers an area of 18.56 km and had a population of 118,227 at the 2010 census and 121,526 at the 2020 census; the official estimate as at mid-2024 was 128,709 (comprising 63,612 males and 65,097 females). It is geographically located in the middle of the Magelang Regency, between Mount Merbabu and Mount Sumbing in the south of the province, and lies 43 km north of Yogyakarta, 15 km north of Mungkid and 75 km south of Semarang, the capital of Central Java. Founded in the 907 AD, Magelang is one of the oldest cities in Indonesia.

Temanggung Regency (Indonesian: Kabupaten Temanggung) is an inland regency in the Central Java Province of Indonesia. It covers a land area of 870.65 km and had a population of 708,546 at the 2010 Census and 790,174 at the 2020 Census; the official estimate as of mid-2024 was 814,879, comprising 409,118 males and 405,761 females; it was projected to rise to 821,118 at mid 2025. Its capital is the town of Temanggung.

All travellers going to the Dieng temple complex from Yogya or Semarang have to pass through this regency.

Fort Vredeburg Museum (Indonesian: Museum Benteng Vredeburg; Javanese: ꦩꦸꦱꦶꦪꦸꦩ꧀ꦧꦺꦠꦺꦁꦮ꦳ꦽꦢꦼꦧꦸꦂꦒ꧀, romanized: Musiyum Bètèng Vredeburg) was a former colonial fortress located in the city of Yogyakarta, Special Region of Yogyakarta, Indonesia. The military complex—owned by the Yogyakarta Sultanate, but leased to the central government and managed by an agency of the central government—has been converted into a museum of the Indonesian independence struggle which was opened in 1992. It is located in front of Gedung Agung and near the Kraton Yogyakarta (Sultan's Palace).

Walter Spies (15 September 1895 – 19 January 1942) was a German primitivist painter, composer, musicologist, and curator. In 1923 he moved to Java, Indonesia. He lived in Yogyakarta and then in Ubud, Bali starting from 1927, when Indonesia was under European colonial rule as the Dutch East Indies.

Spies is often credited with attracting the attention of Western cultural figures to Balinese culture and art in the 1930s, as he became internationally known and hosted numerous anthropologists, actors, artists and other cultural figures. Spies influenced the direction of Balinese art and drama.