The River Granta is the name of two of the four tributaries of the River Cam, although both names are often used synonymously. The Granta starts near the village of Widdington in Essex, flowing north past Audley End House to merge with the other contributary Rhee, which is also commonly called River Cam, a mile south of Grantchester. From source to its confluence with the Rhee it is in length.
