Henry Hudson begins his exploration of the Hudson River while aboard the Halve Maen.

Henry Hudson was an English sea explorer and navigator during the early 17th century, best known for his explorations of present-day Canada and parts of the Northeastern United States.

The Hudson River, historically the North River, is a 315-mile (507 km) river that flows from north to south largely through eastern New York state. It originates in the Adirondack Mountains at Henderson Lake in the town of Newcomb, and flows south to the New York Bay, a tidal estuary between New York and Jersey City, before draining into the Atlantic Ocean. The river marks boundaries between several New York counties and the eastern border between the U.S. states of New York and New Jersey. The lower half of the river is a tidal estuary, deeper than the body of water into which it flows, occupying the Hudson Fjord, an inlet that formed during the most recent period of North American glaciation, estimated at 26,000 to 13,300 years ago. Even as far north as the city of Troy, the flow of the river changes direction with the tides.

Halve Maen was a Dutch East India Company jacht that sailed into what is now New York Harbor in September 1609. She had a length of 21 metres and was commissioned by the VOC Chamber of Amsterdam in the Dutch Republic to covertly find a northern passage to Asia. The ship was captained by Henry Hudson, an Englishman in the service of the Dutch Republic.