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Batu, officially the City of Batu, is a city in the East Java Province of Indonesia. It is about 20 km to the northwest of Malang. Formerly, it was a part of Malang Regency; but in June 2001, Batu became an independent city (by Act No. 11 of 2001), with its own mayor and council.

With a population of 213,046 people at the 2020 Census, which rose to 225,408 as officially estimated as of mid 2025 (comprising 113,186 males and 112,222 females), Batu lies on the southern slopes of Mount Arjuno-Welirang. Its population largely consists of Javanese. The town used to be a recreation place for the Dutch colonial officers in the Dutch colonial area (before 1945). Batu means "rock" in Indonesian.

Since the 10th century, the area of Batu and its surroundings has been known as a resting place for the royal family, because the region is a mountainous area with comfortable air, also supported by the beauty of natural scenery as a characteristic of mountainous regions.

During the reign of the Mataram Kingdom under King Sindok, a royal official named Mpu Supo was ordered by the King to build a royal family resting place in the mountains with nearby water springs. With a hard effort, finally Mpu Supo discovered an area that is now better known as the tourist area of Songgoriti. With the approval of King Sindok, Mpu Supo began to build the Songgoriti area as a royal family retreat and built a temple named Supo Temple.

Some local community leaders said that the title Batu comes from the name of a cleric follower of Prince Diponegoro named Abu Ghonaim referred to as the Kyai Gubug Angin which later the local community was familiar with calling Mbah Wastu. From Javanese cultural habits that often shorten and shorten the designation of someone's name which is considered too long, also to make it shorter and faster when calling someone, finally Mbah Wastu is called Mbah Tu to be Mbatu or Batu as a term used for a mild climate city in East Java.

The history of Abu Ghonaim's existence as a forerunner and person known as a community leader who started the "babad alas" which was used as an inspiration from the designation of the Batu region. Abu Ghonaim was from the Central Java region. Abu Ghonaim as a loyal follower of Prince Diponegoro, intentionally left his native area of Central Java and moved to the hillside of Mount Panderman to avoid the pursuit and arrest of the Dutch soldiers (Kompeni). Abu Ghonaim or Mbah Wastu started his new life together with the surrounding community. Finally, many residents and surrounding communities and other communities came around the residence of Mbah Wastu. Initially, they lived in a group (community) in the Bumiaji, Sisir and Temas.

centerView of Batu from Mount Banyak Prominent mountains around Batu are Mount Anjasmoro (2,277 m), Mount Arjuno (3,339 m), Mount Welirang (3,156 m), Mount Banyak (1,306 m), Mount Kawi (2,551 m), Mount Panderman (2,045 m), Mount Semeru (3.676 m), and Mount Wukir (335 m).

Most of the topography of Batu City is dominated by highland and hilly terrain with valleys running down mountain slopes. In northern Batu, there is a dense forest, Raden Soerjo Forest Park, which is a protected forest area.

Most soils in Batu city are andosols, sequentially present with cambisol, latosol and alluvial. These form mechanical soils which contain substantial amounts of minerals coming from volcanic eruptions. These soils tend to be very fertile.

Batu city at lower elevation features a tropical monsoon climate (Köppen Am), while higher elevations, are classified as a subtropical highland climate (Cwb). The driest month is August with a total precipitation of, while the wettest month is January with a total precipitation of. The temperature is moderated by the altitude, as the city is located at an average of above sea level. The hottest month is October with an average maximum of, while the coolest month is July with an average minimum of.