Renfrew Castle was a castle situated near junction of the River Clyde and White Cart upon the former river islet, known as the King's Inch, at Renfrew, Renfrewshire, Scotland.
The river forms the boundary between East Renfrewshire and South Lanarkshire here before running through the centre of the village of Busby after which it runs around the eastern side of Clarkston and Netherlee where it crosses the Glasgow city boundary into Linn Park, heading downstream to Cathcart.
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