Koderma district occupies the northern end of the Chota Nagpur Plateau.

The topography is hilly and the area mostly has laterite soil with patches of clay.

Koderma Reserve Forest occupies the northern part of the district.

[3] The Barakar River flows in the southern part of the district and supports the multi-purpose Tilaiya Dam.

Poanchkhara, Keso, Akto, Gurio, Gukhana Nadi are the main tributaries of the Barakar in the district.

Ghggnna Naddi and Chhotanari Nadi are the tributaries of the Sakri river.

[7] Gram Panchayats in Jainagar CD Block are: Beko, Chehal, Chandrapur Dandadih, Gadgi, Gharaunja, Gohal, Hirodih, Jainagar East, Jainagar West, Kakorcholi, Kandrapdih, Kariyawan, Kathadih, Katiya, Khariodih, Naitand, Pipcho, Rupaidih, Satdiha, Tamal, Tetron, Tilokrai and Yogiatilha.

[8] According to the 2011 Census of India, Jainagar CD block had a total population of 131,279, all of which were rural.

The gender disparity (the difference between female and male literacy rates) was 30.06%.

It covers 4,000 square kilometres (1,500 sq mi) in Koderma and Giridih districts of Jharkhand and adjacent areas in Bihar.

In the 1990s, when the Soviet Union was divided, the countries in the area stopped buying mica from India.

The entire family, including children, are involved in the illegal activity.

[17] 21,483 wagons of coal were transported to Koderma Thermal Power Station at Banjhedih in Jainagar CD block in 2013–14.

The fund, created by the Government of India, is designed to redress regional imbalances in development.