Question: The River Bourne is the name given to a Thames tributary in northwest Surrey, England which has a longer tributary, the Windle Brook, that rises nears Bagshot Park, a royal residence located near Bagshot, a village 11 mi south of Windsor and approximately 11 mi north west of Guildford, owned by who?
Sentence (from "Longest rivers of the United Kingdom"): Thus the River Ure / River Ouse can be counted as one river system or two rivers.
Relevant evidence: No