Bojonegoro is a regency in East Java

East Java

East Java is a province of Indonesia. It is located on the eastern part of the island of Java and includes neighboring Madura and islands to its east and to its north East Java is a province of Indonesia. It is located on the eastern part of the island of Java and includes neighboring Madura and...

, Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

, about 110 km west of Surabaya

Surabaya

Surabaya is Indonesia's second-largest city with a population of over 2.7 million , and the capital of the province of East Java...

. Bojonegoro is located in the inland part of northern Java

Java

Java is an island of Indonesia. With a population of 135 million , it is the world's most populous island, and one of the most densely populated regions in the world. It is home to 60% of Indonesia's population. The Indonesian capital city, Jakarta, is in west Java...

 plain, on the banks of the Bengawan Solo

Bengawan Solo River

Bengawan Solo River is the longest river on the Indonesian island of Java, approximately 600 km in length. Apart from its importance as watercourse to the inhabitants and farmlands of the eastern and northern parts of the island, it is a renowned region in paleoanthropology circles...

 river, the largest river in Java.

Previously known as a major producer of teak

Teak

Teak is the common name for the tropical hardwood tree species Tectona grandis and its wood products. Tectona grandis is native to south and southeast Asia, mainly India, Indonesia, Malaysia, and Burma, but is naturalized and cultivated in many countries, including those in Africa and the...

 and tobacco

Tobacco

Tobacco is an agricultural product processed from the leaves of plants in the genus Nicotiana. It can be consumed, used as a pesticide and, in the form of nicotine tartrate, used in some medicines...

, Bojonegoro is a the focus of attention in Indonesia as a new oil field

Oil field

An oil field is a region with an abundance of oil wells extracting petroleum from below ground. Because the oil reservoirs typically extend over a large area, possibly several hundred kilometres across, full exploitation entails multiple wells scattered across the area...

 has been found in this area. This oil find is the biggest oil discovery in Indonesia in three decades and one of the biggest reserve in Indonesia.
Across the eastern border of Bojonegoro is the Lamongan Regency, to the north is Tuban

Tuban

Tuban is a town located on the north coast of Java, in Tuban Regency, approximately 100 km west of Surabaya, the capital of East Java. Tuban is surrounded by Lamongan in the east, Bojonegoro in the south and Rembang, Central Java in the west....

 while to the south is Ngawi

Ngawi Regency

Ngawi is a regency of East Java, Indonesia.Ngawi is well known around the world for its Pithecantropus erectus that found by Eugene Dubois, a Dutch.Ngawi located at the central of East Java province and Central Java province...

, Madiun

Madiun

Madiun is a city in the western part of the province of East Java Indonesia, an agricultural centre. It is the capital of the regency of the same name....

, Nganjuk

Nganjuk

Nganjuk is a regency of East Java, Indonesia....

 and Jombang

Jombang Regency

Jombang is a regency of East Java, Indonesia. Its capital is Jombang. The regency has an area of 1,159.5 km² and population of 1,163,420...

.