<P> The Narrows were most likely formed about 6,000 years ago at the end of the last ice age . Previously, Staten Island and Long Island were connected, preventing the Hudson River from terminating via the Narrows . At that time, the Hudson River emptied into the Atlantic Ocean through a more westerly course through parts of present - day northern New Jersey, along the eastern side of the Watchung Mountains to Bound Brook, New Jersey and then on into the Atlantic Ocean via Raritan Bay . A buildup of water in the Upper New York Bay eventually allowed the Hudson River to break through previous land mass that was connecting Staten Island and Brooklyn to form the Narrows as it exists today . This allowed the Hudson River to find a shorter route to the Atlantic Ocean via its present course between New Jersey and New York City . </P> <P> The river was called Ca - ho - ha - ta - te - a ("the river") by the Iroquois, and it was known as Muh - he - kun - ne - tuk ("river that flows two ways") by the Mohican tribe who formerly inhabited both banks of the lower portion of the river . The Delaware Tribe of Indians (Bartlesville, Oklahoma) considers the closely related Mohicans to be a part of the Lenape people, and so the Lenape also claim the Hudson as part of their ancestral territory, naming the river Muhheakantuck ("river that flows two ways"). </P> <P> The first known European name for the river was the Rio San Antonio as named by the Portuguese explorer in Spain's employ, Estêvão Gomes, who explored the Mid-Atlantic coast in 1525 . Another early name for the Hudson used by the Dutch was Rio de Montaigne . Later, they generally termed it the Noortrivier, or "North River", the Delaware River being known as the Zuidrivier, or "South River". Other occasional names for the Hudson included: Manhattes rieviere "Manhattan River", Groote Rivier "Great River", and de grootte Mouritse reviere, or "the Great Mouritse River" (Mourits is a Dutch surname). The translated name North River was used in the New York metropolitan area up until the early 1900s, with limited use continuing into the present day . The term persists in radio communication among commercial shipping traffic, especially below the Tappan Zee . The term also continues to be used in names of facilities in the river's southern portion, such as the North River piers, North River Tunnels, and the North River Wastewater Treatment Plant . It is believed that the first use of the name Hudson River in a map was in a map created by the cartographer John Carwitham in 1740 . </P> <P> In 1939, the magazine Life described the river as "America's Rhine", comparing it to the 40 - mile (64 km) stretch of the Rhine in Central and Western Europe . </P>

When did the hudson river get its name
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