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Volga river.
The River Rhine has an average width of 400m However at the source the Rhine's width will be dramatically smaller and at the mouth the width may be considerably larger. It all depends on what point along the river you measure.
The Amazon estuary is over 202 miles (325 kilometers) wide.
estuary
An estuary.
According to my research the Congo River's estuary is approximately 200 miles in width and 150 miles in length
The estuary between Shoeburyness and Sheerness is 8 Km wide. The estuary between Whitstable and Foulness is 29 Km
The nearest river to fit your description is the River Aare
As far as I know, A river's mouth is simply called the 'river mouth'!
No, an estuary is where a river widens and flows into the sea.
London is on the River Thames but not quite at its estuary.
The river Rhine.