Samdrup Jongkhar Dzongkhag is situated in the southeastern corner of the country, sharing its southern and northern borders with the Indian states of Assam and Arunachal Pradesh respectively. To its west lies Pemagatshel Dzongkhag and to its north Trashigang Dzongkhag. It has a population of 40,766 (20,786 male and 19,980 female), with 4808 households and an area of 1877.94 sq. km constituting around 4% of the country's total. More than three quarters of its area is under forest cover - higher than the national coverage and of mostly the broad leaved sub-tropical evergreen type. The Dzongkhag is located in the sub-tropical climate zone, extending from an elevation of 200 meters to 3600 meters with major portion of the land within 600 meters to 1200 meters. Its southern strip extending across four Gewogs consists of fertile plain lands. The temperature ranges from a minimum of 14 degree centigrade to a maximum of 36 degree centigrade during the peak summer of the year. Its average annual rainfall is 5309.4 millimeters (as recorded at Aerong). The average annual temperature is 23.8 °C. About 2749 mm of precipitation falls annually.