Elliot Kim
Long Island Sound is a semi-enclosed arm of the North Atlantic Ocean, stretching from New York City to southern Westchester County, Connecticut, and the northern shores of Long Island. It is an ecologically important east coast estuary, with a mix of freshwater from tributaries and saltwater from the Atlantic Ocean. Covering 1,180 square miles, it is 90 miles long and 3-20 miles wide, with a maximum depth of 330 feet. Long Island Sound is the second-largest estuary in the US, with 120 species of finfish, and countless birds.
| Characteristics | Values |
|---|---|
| Width | 3–20 miles (5–32 km) at its widest point, it is 21 miles (33-34 km) wide at the mouth of the Connecticut River near Old Lyme, Connecticut |
| Length | 90 miles (145 km) |
| Area | 1,180 square miles (3,056 square km) |
| Depth | 65–230 feet (20–70 m); maximum depth of 330 feet (100 m) |
| Tidal Range | 3 feet (1 m) in the east to 6 feet (2 m) in the west |
| Orientation | East-to-west |
| Shoreline | 600 miles |
| Water Type | Mix of freshwater from tributaries and saltwater from the Atlantic Ocean |
| Watershed Population | 8.93 million (as of the 2010 census) |
| Number of Species | Home to 120 species of finfish, countless birds, and over 170 species of fish |
| Spawning Grounds | Used by 50 different species for annual spawning grounds |
| Water Bodies | The Housatonic, the Thames, and the Connecticut rivers flow into it |
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What You'll Learn
Long Island Sound's width varies
Long Island Sound is a semi-enclosed arm of the North Atlantic Ocean, lying between the New York–Connecticut shore to the north and Long Island to the south. It covers 1,180 square miles (3,056 square km) and is 90 miles (145 km) long. Its width varies from 3 to 20 miles (5–32 km) wide, with its widest point being 21 miles (33 kilometres). The deepest point is 65 feet (20 metres), although other sources state a maximum depth of 230 feet (70 metres).
The Sound is an ecologically important east coast estuary, with a mix of freshwater from tributaries and saltwater from the Atlantic Ocean. It is the second-largest estuary in the U.S. and the most densely used in North America. Its unique east-to-west orientation creates approximately 600 miles of shoreline between Connecticut and New York. The watershed of Long Island Sound is extensive, with parts of six states, extending to the Canadian border, considered to be within it. The whole watershed population is about 8.93 million as of the 2010 census.
The Sound provides feeding, breeding, and nesting areas for a wide variety of plants and animals. It is home to over 170 species of fish, including summer flounder, bluefish, and butterfish, as well as approximately 120 species of finfish and countless birds. It also supports a diversity of shellfish, waterfowl, and plant life. The Connecticut River is the longest of several major rivers that flow into the Sound, providing 90% of its freshwater.
Long Island Sound has a warm temperate climate, with hot and humid summers and cooler months featuring cold temperatures and a mix of rain and occasional snow. The mean tidal range is from less than 3 feet (1 metre) in its eastern reaches to more than 6 feet (2 metres) in the west. It experiences two high tides and two low tides every day.
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It's an ecologically important estuary
Long Island Sound is a semi-enclosed arm of the North Atlantic Ocean, stretching 110 miles (180 km) from west to east and 3–21 miles (5–34 km) from north to south. It is an ecologically important estuary, a place where saltwater from the ocean mixes with freshwater from rivers draining from the land.
Estuaries are among the most productive ecosystems on Earth. They serve as feeding, breeding, and nursery grounds for many species that spend most of their adult lives in the ocean. Long Island Sound is home to over 1,200 species of invertebrates, 170 species of fish, and dozens of species of migratory birds that live at least part of the year in the area. The Sound's coastal communities are home to more than 4 million people, and its watershed includes nearly 9 million people.
The Sound's waters are rich in plankton and bottom-dwelling organisms, making it favourable for young fish but less so for commercially valuable fish. Lobsters, crabs, clams, and oysters are caught along the Connecticut shores, supporting commercial and recreational shellfishing. The Sound is also used by ferries, ships, and barges for transporting people and goods into deep-water harbors.
Long Island Sound is ecologically significant, with a diverse range of species and habitats. It was designated an Estuary of National Significance by the US Congress in 1987. Efforts have been made to improve the health of the Sound, including the Long Island Sound Study (LISS) in 1985, which aims to restore and clean up the region. The Sound's economic value is also notable, generating approximately $9.4 billion annually for the regional economy.
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The deepest point is 65 feet
Long Island Sound is a semi-enclosed arm of the North Atlantic Ocean, stretching from New York City to southern Westchester County, Connecticut, and the northern shores of Long Island. It covers 1,180 square miles and is 90 miles long. Its width varies from 3 to 21 miles, and its depth ranges from 65 to 230 feet. The deepest point of Long Island Sound is 65 feet, and it is considered relatively shallow compared to other bodies of water. This depth is a result of the continental ice sheet that scraped off an average of 65 feet of surface material from the New England landscape. This process, known as glaciation, shaped the landscape and contributed to the formation of Long Island itself.
The Sound is an ecologically important estuary, providing a mix of freshwater from tributaries and saltwater from the Atlantic Ocean. Estuaries are highly beneficial ecosystems as they offer breeding, feeding, nesting, and nursery areas for a diverse array of species. Long Island Sound, in particular, is known for its rich variety of shellfish, finfish, waterfowl, and plant life. It is estimated to be home to around 120 species of finfish and countless birds. Additionally, the Sound's waters contain over 170 species of fish, including summer flounder, bluefish, and butterfish.
The unique geography of Long Island Sound also contributes to its ecological significance. Its bays and inlets add up to approximately 600 miles of shoreline, providing extensive habitats for various flora and fauna. The mix of saltwater and freshwater influences gives rise to diverse environments, including salt marshes, tidal flats, submerged bottom, and open water. The eastern end, where Connecticut borders Rhode Island, is the saltiest part due to its proximity to the Atlantic Ocean.
Long Island Sound has a long history of human utilisation. Pre-colonially, upwards of 15,000 Native Americans took advantage of the abundant hunting and fishing opportunities along its coastlines and adjacent forests. In more recent times, it has become a popular destination for swimming, boating, and fishing, attracting countless visitors to its soft sandy beaches. The Sound is also utilised for sport fishing, with weakfish and bluefish being among the popular catches.
The deepest point of Long Island Sound, at 65 feet, is an important characteristic that shapes the ecology and history of this valuable estuary. It influences the habitats and species supported by the Sound and contributes to its appeal for recreational and economic activities.
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The widest area is near Old Lyme
Long Island Sound, an ecologically important east coast estuary, spans the borders of New York and Connecticut. Its bays and inlets wind along coastal communities, creating approximately 600 miles of shoreline. The Sound is a semi-enclosed arm of the North Atlantic Ocean, lying between the New York–Connecticut shore to the north and Long Island to the south. It covers 1,180 square miles and is 90 miles long.
The width of Long Island Sound varies, with its narrowest point being 3 miles across and its widest point being 21 miles across. The widest area is near Old Lyme, at the mouth of the Connecticut River. This is in Connecticut, which has an extensive coastline along the Sound. The Connecticut River is the longest of several major rivers that flow into Long Island Sound, and it provides a significant amount of freshwater to the Sound.
The unique boundaries of Long Island Sound have led to it being referred to as an "Urban Sea." This is because it extends from one of the most densely populated areas on the Eastern Seaboard and meanders past several cities and towns. The Sound is also an important habitat, providing feeding, breeding, and nesting areas for a variety of plants and animals. It is home to approximately 120 species of finfish and countless birds.
Long Island Sound is also historically significant, with upwards of 15,000 Native Americans making use of the bountiful hunting and fishing along its coastlines and adjacent forests in pre-colonial times. In 1614, Dutch explorer Adriaen Block became the first European to sail the entire Sound, opening the area up to trading and colonial settlement. Today, Long Island Sound remains a popular destination for swimming, boating, and fishing.
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It's also known as the 'Urban Sea'
Long Island Sound is a semi-enclosed arm of the North Atlantic Ocean, lying between the New York–Connecticut shore to the north and Long Island to the south. It covers 1,180 square miles (3,056 square km), is 90 miles (145 km) long, and varies in width from 3–20 miles (5–32 km), reaching 21 miles (34 km) at its widest point. The Sound is an estuary where saltwater from the Atlantic Ocean mixes with freshwater from several rivers, including the Connecticut River. This unique environment supports a rich diversity of life, with over 100 plant species, 1,200 invertebrates, and 170 fish species. The varied salinity due to tides has resulted in essential tidal marshes and wetlands that are vital for both marine and shoreline biodiversity.
Long Island Sound is also known as the Urban Sea due to the dense population surrounding it. In 2024, about 25 million people lived within 50 miles of the Sound, and about 9 million people lived in its watershed. The region is one of the most densely populated areas in the United States. This heavy human presence has resulted in significant pollution from industrial, agricultural, municipal, and recreational activities. The Sound has been polluted by untreated sewage, urban runoff, and toxic substances such as heavy metals. However, efforts are being made to reduce these environmental impacts, including the Long Island Sound Restoration Act and initiatives to lower nitrogen levels in the water.
The Sound's dynamic ecosystem experiences dramatic seasonal temperature changes and fluctuating salinity levels due to tides. Organisms living in this environment have adapted to these constant fluctuations. The area is economically important, providing approximately 200,000 jobs and ecosystem services valued at billions of dollars annually.
The Sound's water depth varies from 65 to 230 feet (20 to 70 meters), with a maximum depth of over 300 feet (100 meters) in certain areas. Two glacial advances have contributed to this depth, and the mean tidal range varies from less than 3 feet (1 meter) in the east to over 6 feet (2 meters) in the west. The water is influenced by a large exchange with ocean water in the east and a minor exchange with New York Harbor in the west.
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Frequently asked questions
Long Island Sound is 3–20 miles (5–32 km) wide. At its widest point, it is 21 miles (33-34 km) wide.
Long Island Sound lies between the New York–Connecticut shore to the north and Long Island to the south.
Long Island Sound is 90 miles (145 km) long.
The depth of Long Island Sound varies from 65 to 230 feet (20 to 70 m).
