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Tappan Zee
TappanZee NorthofBridge.jpg
Northern Tappan Zee
Country United States
State New York
Physical characteristics
Main source Hudson River, by way of Haverstraw Bay
Croton-on-Hudson, New York
0 ft (0 m)
41°10′03.64″N 73°53′54.65″W / 41.1676778°N 73.8985139°W / 41.1676778; -73.8985139
River mouth North River (Lower Hudson)
Dobbs Ferry, New York
0 ft (0 m)
41°00′47.20″N 73°53′28.81″W / 41.0131111°N 73.8913361°W / 41.0131111; -73.8913361
Length 10.5 mi (16.9 km), North-South
Basin features
Tributaries
NOAA Nav Chart 12343

The Tappan Zee ( also Tappan Sea or Tappaan Zee) is a natural widening of the Hudson River, about 3 miles (4.8 km) across at its widest, in southeastern New York. It stretches about 10 miles (16 km) along the boundary between Rockland and Westchester counties, downstream from Croton Point to Irvington. It derives its name from the Tappan Native American sub-tribe of the Delaware/Lenni Lenape, and the Dutch word zee, meaning a sea.

Flanked to the west by high steep bluffs of the Palisades, it forms something of a natural lake on the Hudson about 10 miles (16 km) north of Manhattan. Communities along the Tappan Zee include Nyack on the western side as well as Ossining and Tarrytown on the eastern side. It was formerly crossed by the original Tappan Zee Bridge, opened in 1955 and about 3.1 miles (5.0 km) long, connecting Nyack and Tarrytown. Today, it is crossed by the new Tappan Zee Bridge (officially the Governor Mario M. Cuomo Bridge), which opened in 2017 (north or westbound span) and 2018 (south or eastbound span) at about the same length as the old bridge.

On September 14, 1609, the explorer Henry Hudson entered the Tappan Zee while sailing upstream from New York Harbor. At first, Hudson believed the widening of the river indicated that he had found the Northwest Passage. He proceeded upstream as far as present-day Troy before concluding that no such strait existed there.

Francis Augustus Silva - The Hudson at the Tappan Zee - Google Art Project
Francis Augustus Silva:The Hudson at the Tappan Zee, 1876. Oil on canvas. Brooklyn Museum

The Tappan Zee is mentioned several times in Washington Irving's famous short story, "The Legend of Sleepy Hollow". The tale is set in the vicinity of Tarrytown, in the area near Irving's own home at Sunnyside. In Frederik Pohl's 1977 Hugo award-winning novel Gateway, the main character Robinette Broadhead has "a summer apartment overlooking the Tappan Sea and The Palisades Dam". Pohl lived in the area while writing the book.

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