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Thames clippers are a ferry service between West London and East London along the River Thames. Putney is the westerly terminus and Woolwich Arsenal Pier the easterly terminal.
Wikipedia: Link

Greenwich Pier is on the south bank of the River Thames in the Royal Borough of Greenwich in Greater London. It was built in 1836 to cater for the many paddle steamers that brought visitors on day trips to Greenwich from London further up river.
The pier is currently operated by London River Services and is used by various river operators, running public cruise services to and from Central London. It is immediately adjacent to the Cutty Sark and is within easy walking distance of a variety of other popular attractions.

The River Thames rises at Thames Head in Gloucestershire ST9899 on the slopes of the Cotswolds and flows generally eastward to its mouth near Southend in Essex. At 215 miles long it is the second longest river in Britain after the Severn, and the longest entirely within England. Link