The word dock (from Dutch dok) in American English refers to one or a group of human-made structures that are involved in the handling of boats or ships (usually on or near a shore).The earliest known docks were those discovered in Wadi al-Jarf, an ancient Egyptian harbor, of Pharaoh Khufu, dating from c.2500 BC located on the Red Sea coast.[6] Modern oceanographers have observed that the ancient Harappans must have possessed great knowledge relating to tides in order to build such a dock on the ever-shifting course of the Sabarmati, as well as exemplary hydrography and maritime engineering.[7] This knowledge also enabled them to select Lothal's location in the first place, as the Gulf of Khambhat has the highest tidal amplitude and ships can be sluiced through flow tides in the river estuary.In the cottage country of Canada and the United States, a dock is a wooden platform built over water, with one end secured to the shore.