<Table> <Tr> <Td colspan="2"> Thames </Td> </Tr> <Tr> <Td colspan="2"> River </Td> </Tr> <Tr> <Td colspan="2"> The Thames in London </Td> </Tr> <Tr> <Th> Country </Th> <Td> England </Td> </Tr> <Tr> <Th> Counties </Th> <Td> Gloucestershire , Wiltshire , Oxfordshire , Berkshire , Buckinghamshire , Surrey , Middlesex , London , Kent , Essex </Td> </Tr> <Tr> <Td colspan="2"> </Td> </Tr> <Tr> <Th> Towns / Cities </Th> <Td> Cricklade , Lechlade , Oxford , Abingdon , Wallingford , Reading , Henley - on - Thames , Marlow , Maidenhead , Windsor , Staines - upon - Thames , Walton - on - Thames , Kingston upon Thames , Teddington , Richmond , London , London </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> Thames Head , Gloucestershire , UK </Td> </Tr> <Tr> <Td> - elevation </Td> <Td> 110 m ( 361 ft ) </Td> </Tr> <Tr> <Td> - coordinates </Td> <Td> 51 ° 41 ′ 39 '' N 2 ° 01 ′ 47 '' W ﻿ / ﻿ 51.694262 ° N 2.029724 ° W ﻿ / 51.694262 ; - 2.029724 </Td> </Tr> <Tr> <Th> Mouth </Th> <Td> Thames Estuary , North Sea </Td> </Tr> <Tr> <Td> - location </Td> <Td> Southend - on - Sea , Essex , UK </Td> </Tr> <Tr> <Td> - elevation </Td> <Td> 0 m ( 0 ft ) </Td> </Tr> <Tr> <Td> - coordinates </Td> <Td> 51 ° 29 ′ 56 '' N 0 ° 36 ′ 31 '' E ﻿ / ﻿ 51.4989 ° N 0.6087 ° E ﻿ / 51.4989 ; 0.6087 Coordinates : 51 ° 29 ′ 56 '' N 0 ° 36 ′ 31 '' E ﻿ / ﻿ 51.4989 ° N 0.6087 ° E ﻿ / 51.4989 ; 0.6087 </Td> </Tr> <Tr> <Td colspan="2"> </Td> </Tr> <Tr> <Th> Length </Th> <Td> 346 km ( 215 mi ) </Td> </Tr> <Tr> <Th> Basin </Th> <Td> 12,935 km ( 4,994 sq mi ) </Td> </Tr> <Tr> <Th> Discharge </Th> <Td> for London </Td> </Tr> <Tr> <Td> - average </Td> <Td> 65.8 m / s ( 2,324 cu ft / s ) </Td> </Tr> <Tr> <Td> - max </Td> <Td> 370 m / s ( 13,066 cu ft / s ) </Td> </Tr> <Tr> <Td colspan="2"> Discharge elsewhere ( average ) </Td> </Tr> <Tr> <Td> - entering Oxford </Td> <Td> 17.6 m / s ( 622 cu ft / s ) </Td> </Tr> <Tr> <Td> - leaving Oxford </Td> <Td> 24.8 m / s ( 876 cu ft / s ) </Td> </Tr> <Tr> <Td> - Reading </Td> <Td> 39.7 m / s ( 1,402 cu ft / s ) </Td> </Tr> <Tr> <Td> - Windsor </Td> <Td> 59.3 m / s ( 2,094 cu ft / s ) </Td> </Tr> <Tr> <Td colspan="2"> </Td> </Tr> <Tr> <Td colspan="2"> Map of the Thames within southern England </Td> </Tr> </Table>
where did the river thames start and end
Thames Head , Gloucestershire , UK Southend - on - Sea , Essex , UK