An OAR is a boat-steering aid that consists of a long shaft with a flat blade at one end. It is used to propel a boat through the water by pushing against the water. Oars are typically used in small boats, such as rowboats, canoes, and kayaks, but can also be used in larger vessels, such as galleys and barges. Oars are usually held in place by oarlocks, which are attached to the boat's gunwales.