ferries, other non-cargo". General cargo ships include "multi-purpose and project vessels and Roll-on/roll-off cargo". Cargo ship A cargo ship or freighter is any sort of ship or vessel that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's seas and oceans each year; they handle the bulk of international trade. Cargo ships are usually specially designed for the task, often being equipped with cranes and other mechanisms to load and unload, and come in all sizes. Bulk carrier A bulk carrier is a ship used to transport bulk cargo items such as iron ore, bauxite, coal, cement, grain and similar cargo. Bulk carriers can be recognized by large box-like hatches on deck, designed to slide outboard or fold fore-and-aft to enable access for loading or discharging cargo. The dimensions of bulk carriers are often determined by the ports and sea routes that they need to serve, and by the maximum width of the Panama Canal. Most lakes are too small to accommodate bulk carriers, but a large fleet of lake freighters has been plying the Great Lakes and St. Lawrence Seaway of North America for over a century. Container ship A container ship is a cargo ship that carries its cargo in standardized containers, in a technique called containerization. These ships are a common means of commercial intermodal freight transport. Tanker A tanker is a ship designed to transport liquids in bulk. Tankers can range in size from several hundred tons, designed to serve small harbours and coastal settlements, to several hundred thousand tons, with these being designed for long-range haulage. A wide range of products are carried by tankers, including: hydrocarbon products such as oil, LPG, and LNG chemicals, such as ammonia, chlorine, and styrene monomer fresh water wine Different products require different handling and transport, thus special types of tankers have been built, such as chemical tankers, oil tankers, and gas carriers. Among oil tankers, supertankers were designed for carrying oil around the Horn of Africa from the Middle East; the FSO Knock Nevis being the largest vessel in the world, a ULCC supertanker formerly known as Jahre Viking (Seawise Giant). It has a deadweight of 565,000 metric tons and length of about . The use of such large ships is in fact very unprofitable, due to the inability to operate them at full cargo capacity; hence, the production of