cost. Shenzhen was ranked 4th in list of world's busiest container ports and Shekou Container Terminals was one of the four major terminals of Shenzhen. Operations P&O (aka DP World) manages two ports in the UK: a container port at the north end of Southampton, and one on the north bank of the Thames, in Essex. P&O operates the following ferry companies: P&O Ferries P&O Portsmouth P&O Irish Sea P&O Stena Line See also Other port operators in the UK include: Associated British Ports Mersey Docks and Harbour Company, a unit of Peel Ports PD Ports P&O Maritime Services References External links P&O Heritage Collection Official site Clydeside built P&O ships A travel journalist's article about P&O Cruises Third Class/Steerage Passengers' Contract Ticket P. & O. Line SS Commonwealth dated 18 August 1921 GG Archives Shipping companies of England British companies established in 1837 Companies disestablished in 2006 Companies formerly listed on the London Stock Exchange Port operating companies Defunct shipping companies of the United Kingdom 2006 mergers and acquisitions