River Murray, Australia, True Colour Satellite Image. The river Murray, the longest in Australia, has a dark green colour because of algae, the turquoise areas are swamps covering up former river bends, and the white dots are depositions of salt. North of the river is the Lake Victoria, a water reservoir. South of the image are cultivated fields and virgin nature [image taken at the border between the State of Victoria, West, and the State of South Australia, East]. Image taken on 20 November 1989 using LANDSAT data.