Barmer District is a district in Rajasthan state of India. It is located in the western part of Rajasthan state forming a part of the Thar Desert. Barmer is the third largest district by area in Rajasthan and fifth largest district in India, occupying an area of 28,387 km2. Being in the western part of the state, it includes a part of the Thar Desert. Jaisalmer is to the north of this district while Jalore is in its south.