<Table> <Tr> <Td_colspan="2"> Colne </Td> </Tr> <Tr> <Td_colspan="2"> River </Td> </Tr> <Tr> <Td_colspan="2"> River Colne as it joins the Thames at Staines - upon - Thames </Td> </Tr> <Tr> <Th> Country </Th> <Td> England </Td> </Tr> <Tr> <Th> Counties </Th> <Td> Hertfordshire, Greater London, Buckinghamshire, Surrey, Berkshire </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Tributaries </Td> </Tr> <Tr> <Td> - left </Td> <Td> Mimmshall Brook, Tykes Water, River Pinn </Td> </Tr> <Tr> <Td> - right </Td> <Td> Ellen Brook, River Ver, River Gade, River Chess, River Misbourne </Td> </Tr> <Tr> <Th> Towns </Th> <Td> Watford, Uxbridge, West Drayton, Staines - upon - Thames </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Source </Th> <Td> </Td> </Tr> <Tr> <Td> - location </Td> <Td> North Mymms </Td> </Tr> <Tr> <Th> Mouth </Th> <Td> River Thames </Td> </Tr> <Tr> <Td> - location </Td> <Td> Staines - upon - Thames </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Discharge </Th> <Td> for Denham, Buckinghamshire </Td> </Tr> <Tr> <Td> - average </Td> <Td> 4.05 m / s (143 cu ft / s) </Td> </Tr> <Tr> <Td> - max </Td> <Td> 18.4 m / s (650 cu ft / s) 14 October 1993 </Td> </Tr> <Tr> <Td> - min </Td> <Td> 0.74 m / s (26 cu ft / s) 26 August 1976 </Td> </Tr> <Tr> <Td_colspan="2"> Discharge elsewhere (average) </Td> </Tr> <Tr> <Td> - Berrygrove </Td> <Td> 0.79 m / s (28 cu ft / s) </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Colne </Td> </Tr>

Where does the river colne start and finish
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