While I agree with your point about cities. London is on the tidal stretch of the thames, and the second biggest port in the UK https://en.wikipedia.org/wiki/Li

While I agree with your point about cities. London is on the tidal stretch of the thames, and the second biggest port in the UK https://en.wikipedia.org/wiki/List_of_busiest_ports_in_Europe https://en.wikipedia.org/wiki/List_of_busiest_ports_in_Europ...