<Tr> <Td> Maidenhead </Td> <Td> <Table> <Tr> <Td> </Td> </Tr> </Table> </Td> <Td_colspan="2"> Taplow </Td> </Tr> <Table> <Tr> <Td> </Td> </Tr> </Table> <Tr> <Td> Bray </Td> <Td> <Table> <Tr> <Td> </Td> </Tr> </Table> </Td> <Td_colspan="2"> Taplow </Td> </Tr> <Table> <Tr> <Td> </Td> </Tr> </Table>

Where does the river thames start and end map