River Og
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The River Og is a short river in Wiltshire, England.
River Og, near Ogbourne St Andrew.
Chalk stream
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Chalk streams are rivers that rise from springs in landscapes with chalk bedrock. Since chalk is permeable, water easily percolates through the ground to the water table and chalk streams therefore re
The River Bourne at Winterbourne Gunner, a typical chalk stream
Commercial watercress production near New Alresford in Hampshire