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.

[1][2] Karma, a constituent town in Koderma CD block, is located at 24°26′38″N 85°33′4″E / 24.44389°N 85.55111°E / 24.44389; 85.55111.

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, Chhotanari Nadi are the tributaries of Sakri river.

[6] Gram Panchayats in Koderma CD block are: Bekobar (North), Bekobar (South), Charadih, Chhatarbar, Dumardiha, Inderwa, Jarga, Jhumri, Karma, Kauawar Gajhandi, Kharkotta, Kolgarma, Lariyadih, Lokai, Meghatari, Pandedih, Pathaldiha and Purnanagar.

[7] According to the 2011 Census of India, Koderma CD block had a total population of 93,240, of which 80,303 were rural and 12,937 were urban.

The gender disparity (the difference between female and male literacy rates) was 27.84%.

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