Harirod river basin is one of the fifth main river basin in Afghanistan that is located in western part of the country and covering around 35,695 sq. km area. This river has 2,405 km perimeter and originate from Baba mountains, flow in west direct through Daykundi and Herat province about 612 km to pass the Iran border. Morphometric analysis is carried out for the basin using ASTER DEM data and by means of geo-processing tools in GIS. Twenty-three different morphometric parameters of the river basin are analyzed in the study. Bifurcation ratio for the Harirod river basin is around 4.42 which illustrate strong structure disturbance by the drainage. The Rho value for Harirod River basin is 0.54 that indicate higher hydrologic storage during the floods and reduction of effects of erosion during higher discharges. The value of stream frequency is 0.11, while the value of drainage density is around 0.51, both of these parameter has low values and indicate that the Harirod River basin has permeable sub surface material, dense vegetative cover and low relief. While infiltration number for this river basin is 0.11, illustrates that, the study area has permeable surface as displayed by stream density and stream frequency.