The Marne River in the Eastern Mr Lofty Ranges region of South Australia emerges from Eden Valley on the eastern slopes of the Mount Lofty Ranges — rises west of Springton in the Eden Valley. It flows in an easterly direction where it eventually discharges into the River Murray near Wongulla to the north of Walker Flat.
The photo below is of the Marne River in early spring which flows near the village of Cambrai that is on the edge of the Murray Mallee with its old disused railway bridge. The railway line to Sedan is long gone. The major land use in the SA Mallee plains are cereal cropping and sheep grazing that reduces the biodiversity. Agriculture, traditionally, is the enemy of biodiversity.
The Marne was dry, even in early spring after the winter rains. Its flow to the Murray River is now uncommon.
The general view is that much of the flow generated in the hills zone is lost from the water course in the plains zone as recharge to the underlying aquifers, and that significant floods are required for flow to transverse the Murray plains zone to reach the River Murray.
Nourishing Terrains 
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