Ports round the world have been adapted to freight transport by container. The ships that carry containers are huge, and ports must have depth and size to dock ships. China is by far the world's largest user of container transport. Container ships cannot get down the Thames to London, so a modern container port was built at Felixtowe on the Suffolk coast. The Port of Felixtowe is the UK's largest container port, and carries 35% of the UK container cargo. However, it is only the 29th busiest container port in the world. 