The River Bourne begins its course west of Oldbury Hill on the Greensand Ridge in the parish of Ightham .
The River Bourne enters the Medway upstream of East Peckham , near Tonbridge .
The River Bourne begins its course west of Oldbury Hill on the Greensand Ridge in the parish of Ightham and enters the Medway upstream of East Peckham , near Tonbridge .