can you please name any river that is present in the mentioned county?
Thames
Surrey
The longest river to enter Surrey is the Thames, which historically formed the boundary between the county and Middlesex. 
what is denbies? It is a large estate where is it located? To the northwest of Dorking in Surrey, England what is so important about this estate? It was developed as a weekend retreat, that had views of the Surrey landscape. who owns the estate? It was first owned by John Denby.
wiki:11568111
Surrey [SEP] Surrey rivers
The longest river to enter Surrey is the Thames, which historically formed the boundary between the county and Middlesex. As a result of the 1965 boundary changes, many of the Surrey boroughs on the south bank of the river were transferred to Greater London, shortening the length associated with the county. The Thames now forms the Surrey-Berkshire border between Runnymede and Staines-upon-Thames, before flowing wholly within Surrey to Sunbury, from which point it marks the Surrey-Greater London border as far as Surbiton. The River Wey is the longest tributary of the Thames, (when the Medway, which enters into its lower estuary, is excluded).