Bojonegoro Regency
Bojonegoro Regency
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Bojonegoro Regency

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Bojonegoro Regency

Bojonegoro Regency (Indonesian: Kabupaten Bojonegoro, older spelling is Kabupaten Bodjanegara, Javanese: ꦧꦺꦴꦗꦤꦒꦫ, romanized: Bojånegårå) is a regency in East Java Province of Indonesia, about 110 km west of Surabaya and 73 km northeast of Ngawi. It covers a land area of 2,307.06 km2 (890.76 miles2) and is located in the inland part of the northern Java plain, mainly on the south bank of the Solo River, the longest river in Java. It had a population of 1,209,973 at the 2010 Census and 1,301,635 at the 2020 Census; the official estimate as of mid-2024 was 1,366,227 (comprising 686,426 males and 679,801 females). The administrative centre of the regency is the town of Bojonegoro.

Previously known as a major producer of teak and tobacco, Bojonegoro is a focus of attention in Indonesia as a new oil field has been found in this area. This oil find is the biggest oil discovery in Indonesia in three decades and one of the biggest reserves in Indonesia.

Across the eastern border of Bojonegoro is the Lamongan Regency, to the north is the Tuban Regency, while to the south are the Ngawi Regency, Madiun Regency, Nganjuk Regency, and Jombang Regency. Blora Regency is located to the west, in Central Java Province.

Bojonegoro occupies an area of 2,307.06 km2. Much of it consists of low plains along the Solo River, with hilly areas in the southern part of the Regency. As with most of Java, the Bojonegoro landscape is dominated by rice paddy fields. In the Bojonegoro area, the Solo River changes its course from northward to eastward.

The climate in Bojonegoro is tropical with six months of rainy and dry seasons. Seasonal conditions are often very contrasting. In the rainy season, rain will fall almost daily while in the dry season, rain will not come for months, causing widespread drought and water shortages. These problems have been compounded with the loss of forests and other green areas. The teak forest once covered much of Bojonegoro, but has since considerably reduced due to over-exploitation.

Floods in the rainy season of 2007 were bigger than in previous years. The water level of the Solo River rose due to heavy rain, especially in the upper valley in Central Java, forcing the Gajah Mungkur Dam to be opened. The resulting flood submerged 15 districts, with water as high as 1.5 m, and displaced 2,700 families. A further 2.5 hectares of rice fields were damaged. No casualties were reported.

Bojonegoro has 42-100% of humidity. Maximum humidity is 100% and average humidity is 81%. Bojonegoro has 0–35 km/h of wind velocity. Maximum wind velocity is at 35 km/h (18.9 knots). The average wind velocity is 30 km/h (16.2 knots). It has an average temperature of 27.1 °C - 28.2 °C.

The area near the Solo River is fertile and has been settled since early history by the Javanese. However, these settlements never developed into major urban center, except for several coastal cities. Rather, villages are dependent on a weekly market which rotates among them and bakul (traveling peddlers) collect and distribute agricultural and manufactured products among the villages.

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