Tributaries
The two principal tributaries of the Cam are the Granta and the Rhee, though both are also officially known as the Cam. The Rhee begins just off the High Street (Ashwell Springs), Ashwell in Hertfordshire running north then east 12 mi (19 km) through the farmland of southern Cambridgeshire. The longer tributary, the Granta, starts near the village of Widdington in Essex flowing the 15 mi (24 km) north past Audley End House to merge with the Rhee a mile south of Grantchester. A further tributary, also known as the Granta, runs 10 mi (16 km) from south of Haverhill to join the larger Granta south of Great Shelford. Another minor tributary is Bourn Brook which has its source near the village of Eltisley, 10 mi (16 km) west of Cambridge, running east through Caxton, Bourn and Toft to join the Cam at Byron's Pool.
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