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The altitude of the plain above sea level is 50 m, and the topography is subdued and mostly flat; the hills are just below 60 m, the slopes rounded, and there are several forrested gullies.Since the Southern Ocean sea-level stabilised 3000 years ago, the rivers of the Port Phillip Sunkland ceased eroding their channels and have been depositing an alluvium of silt, clay, and sand in the lower reach
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