Cockburn Sound
![Cockburn Sound and Garden Island from space. Image generated by NASA World Wind](/Images/godic/202501/05/GardenIsland0055.png")
![Aerial photograph](/Images/godic/202501/05/Cockburn_Sound0055.jpg")
Cockburn Sound is an inlet of the Indian Ocean on the coast of Western Australia. It extends from the south of the mouth of the Swan River at Fremantle for about 25 km to Cape Peron near Rockingham and is located at 32°10′14″S 115°43′26″E / 32.17056°S 115.72389°E. The total area of the sound is about 100 km².