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Floodplain.
The valley is further upstream. Once the river meanders on the plains its not called a valley anymore. Although it is called an "Old River Valley". Not because of its age but the characteristics that give it the older appearance. It no longer maintains the conventional valley shape.
The catchment is the area that collects and contributes water to the main river. All the tributaries and associated valleys and plains.
BTW The sky became clouded over after my last post and now its sunny again. Maybe in luck tonight.
Cheers
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