Seine River Steamers early vessels meant that positive traction by pulling on a chain against a deadman or anchor was much more effective. In the 1830s river travel was considered dangerous, so much so that insurers would put a 25 percent premium on cargoes and vessels travelling the route. The Seine is divided into three sections, the lower or Oise section, middle or Paris Section, and upper or Marne section. Ships enter the river at Le Havre through a bad tidal bore. (Victor Hugo's favourite daughter was killed while travelling in a small boat across the bore.) Oceangoing ships can travel to Rouen,
Layout of the Port of Tianjin port area is expanding fast, and it is expected to reach a capacity of 100 Mt per year by 2015. Further up the Haihe estuary is the Donggu Fishing Port, which still moors 400 (mostly small) fishing boats. The Tianjin Xingang Fairway is divided into the Main Shipping Channel, the Chuanzhadong Channel, and the Northern Branch Channel. The Dagusha Channel and the Haihe river channel are separate fairways with slightly different regulations. The Dagusha Channel (大沽沙航道) is wholly separate from the Main Channel. It is 27.5 km long from safe water (12 m isobath) to the mouth of the Haihe.