Basar is geographically located in the center of Arunachal Pradesh with coordinates of N27 ° 58.180´ and E094° 41.481´ (at Upper colony). It is administratively a sub-divisional head quarter falling under West Siang District, headed by an Additional Deputy Commissioner. The indigenous tribe of the place is Galo, one of the 26 major tribes of Arunachal Pradesh.
Temperature: Average annual minimum 15.6 (with daily minimum recorded at 1.2 on 9-12-2013) and Average annual maximum 24.2 (with daily maximum recorded at 39.1 on 20-08-2013). The data is on the basis of recording by ICAR, Basar for the period from 1979-2015.
Forest: Evergreen rain forest. Natural vegetation comprises alpine and sub-alpine, temperate (coniferous), semi evergreen and tropical moist deciduous forests.
Rainfall: 2476 mm. Highest rainfall recorded in a day in last 36 years is 213 mm on 28-08-2008.
Soil Type: The texture varies from gravelly loam to gravelly sandy loam, taxonomically classified as Lithic and Typic Udorthents, Entic Haplumbrepts, Dystrict Eutrochrepts, Unbric and typic Dystrochrepts. The soils are strong to moderately acidic in nature, rich in organic matter and generally have low base saturation except some soils in summits and ridges.