The East River: Not a River, But a Tidal Strait

Geography vs. Name

Despite its name, the East River is not a true river. It is a tidal estuary (more precisely, a drowned valley / tidal strait) connecting two large bodies of water: Upper New York Bay (south) and Long Island Sound (north).

Key Characteristics

• Length: ~16 miles (26 km).
• Width: 0.5–2 miles (0.8–3.2 km).
• Flow: Reverses with the tide (flood north to Sound, ebb south to Bay). Salinity varies.
• Sources: Fed by the Hudson River (via Harlem River & Spuyten Duyvil Creek) and the Harlem River.
• Outlet: Flows into the Atlantic via The Narrows (between Brooklyn & Staten Island).

Iconic Infrastructure

It's crossed by 9 bridges (Brooklyn, Manhattan, Williamsburg, Queensboro/59th St, RFK/Triboro, Bronx-Whitestone, Throgs Neck) and 4 tunnels (subway, road, water).

Ecology & Recreation

Once severely polluted, water quality has dramatically improved. Now supports striped bass, bluefish, oysters (restoration), seals. Popular for kayaking (NYC Water Trail), ferry commuting (NYC Ferry), and riverside parks (Brooklyn Bridge Park, East River Esplanade, Roosevelt Island).

Why the Misnomer?

Early European settlers (Dutch/English) named it a "river" because it appeared as a flowing freshwater stream at low tide. The name stuck. Geologically, it's a fjord-like estuary carved by glaciers, flooded by rising seas.