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What makes Yosemite Valley special is the pleasing juxtaposition of cliffs , waterfalls , and domes with a flat valley floor over which a lovely river meanders through wood and meadow . This graph shows the bacterial contamination of a urban river basin and shellfish downstream according to rainfall over an 8 month period . Tugboats maneuvered the behemoth through the 500-foot wide river toward its berth and grounded it in the mud . It is surrounded by spectacular scenery and has easy access to wilderness resources , fjords , caribou herds , seabird colonies and magnificent rivers . Aral Sea , more than twice the flow of the second major river in the region , the Syrdarya .