The type of vessel used by the Vikings for trade and warfare c. 850–1200 ad. Viking warships were long, open, oared vessels, clinker-built and rowed by 40–80 men. They had a short mast carrying a single square sail that could be braced to allow some measure of travel into the wind. The larger vessels had a part-deck fore and aft. Viking trading ships (‘knorrs’) were broader in beam and relied on sails much more than on oar power. The Vikings sailed in such vessels as far as Vinland (Newfoundland) to the west; northern Africa to the south; and the Black Sea to the east.