Mount Stromlo is west of the centre of Canberra, Australia, near the district of Weston Creek. It is about above sea level and above the surrounding plains. The Mount Stromlo Observatory (run by the Australian National University) is on the top of the mountain. Canberra's main water supply treatment plant, supplied by the Cotter River catchment area is nearby. Road access to the mountain is by Cotter Road on the south side, and Uriarra Road on the east and north. The summit is reached by a road joining Cotter road just outside Duffy.