There are two rivers named Bourne in Surrey which join together at St George's College (Woburn Park) near the Thames. This article refers to the southern branch which runs generally north-eastward and its tributaries. It is not to be confused with the River Bourne, Chertsey which begins at sources by Sunninghill and ends at the same place.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 in the south of Swinley Forest, Berkshire, merging with it while flowing through villages north of Woking; downstream the Bourne joins the Thames near Weybridge.