Nicobar district is one of three districts in the Indian Union Territory (UT) of Andaman and Nicobar Islands. The district's administrative territory encompasses all of the Nicobar Islands, which are located in the Indian Ocean (Bay of Bengal, bordering with the Andaman Sea). The headquarters of the district is located on the island of Car Nicobar. The district administration is headed by a Deputy Commissioner, who in turn reports into the Lt. Governor of the Andaman and Nicobar Islands. It is the fifth least populous district in the country (out of 640).