A tanker is a bulk carrier designed to transport liquid cargo, most often petroleum products. Oil tankers vary in size from small coastal vessels of 1,000 tonnes deadweight, through medium-sized ship of 60,000 tons, to the giant VLCCs (very large crude carriers). The largest tanker currently afloat is the Norwegian ship Jahre Viking of 564,650DWT. The ship is 458m in length and has a beam of 68,9m with a draught of 24,6m.