 Chas is located at .Chas CD Block is bounded by Chandrapura CD Block and Baghmara CD Block, in Dhanbad district, on the north, Chandankiyari CD Block on the east, Purulia I and Joypur CD Blocks, in Purulia district of West Bengal, on the south, and Jaridih CD Block on the west.Chas CD Block has an area of 573.95 km2.