Great Lakes ecoregion (2024)

This lake system contains the largest supply of freshwater in the world.

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Find even more resources on the Great Lakes ecoregion inour searchable resource database.

Data resources

Great Lakes forecast data

Searchable invasive species database

Great Lakes bathymetry maps

Lake level viewer

Great Lakes MODIS Imagery Region Map

National Data Buoy Center

Related stories

NOAA teams up with cruise company for Great Lakes research (2020)

Searching for WWII-era aircraft lost in the Great Lakes (2020)

Giant sinkholes are adding water to Lake Huron. Scientists ask: How much? (2019)

The Great Lakes: A national treasure (2017)

NOAA’s lake level viewer for the Great Lakes (2013)

More Collections

Watersheds, flooding, and pollution

Water cycle

The Great Lakes system offsite link includes five large lakes, one small lake, four connecting channels, and the St. Lawrence Seaway. The large lakes are Superior, Michigan, Huron, Erie, and Ontario. They hold about 90% of the freshwater in the United States and approximately 20% of the world's freshwater supply. Forty million residents of the United States and Canada depend on this system for clean drinking water.

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Great Lakes ecoregion (1)

How the Great Lakes formed

During the last ice age, the mile-thick Laurentide ice sheet covered most of Canada and the northern contiguous United States. The massive weight and movement of this glacier gouged out the earth to form the lake basins. About 20,000 years ago, the climate warmed and the ice sheet retreated. Water from the melting glacier filled the basins offsite link, forming the Great Lakes. Approximately 3,000 years ago, the Great Lakes reached their present shapes and sizes. Today, the Great Lakes ecoregion contains a variety of habitats, including aquatic, forest, marsh, wetland, and dune ecosystems. Widely varying climate, soils, and topography support more than 3,500 species of plants and animals.

Kids Creek project restores habitat and food sources for Great Lakes fish

A NOAA-supported project in Traverse City, Michigan, is helping enhance habitat and food sources for fish like brook trout.

Humans and the Great Lakes

Humans are also part of the Great Lakes system. Commercial and sport fishing, agriculture, recreation, tourism, manufacturing, and shipping are all important to the region. These activities create jobs and provide goods and services. The fishing industry extracts millions of pounds offsite link of fish per year from the lakes. Farmers within this watershed produce corn, soybeans, hay, milk, and other food products. The area is also known for its industry that produces steel, chemicals, and other products. The shipping opportunities in the Great Lakes played a critical role in settlement of the region and development of industry. Today more than 200 million tons of cargo pass through its waters each year.

Habitat restoration in the Great Lakes: By the numbers

NOAA’s habitat restoration work in the Great Lakes strengthens healthy fisheries and ecosystems, benefits local economies, and supports resilient communities.

Threats to the Great Lakes

Threats to the Great Lakes' ecosystems, include invasive species, climate change, pollution, and habitat destruction. Climate change affects water temperatures, weather patterns, and lake levels. Pollutants from residential, agricultural, and industrial areas reduce water quality. Land development decreases the amount of wildlife habitat. Fish populations have been declining offsite link in recent years as a result of these threats and increased fishing pressure.

History and economy of the Great Lakes region

Ever since Thunder Bay National Marine Sanctuary was designated in 2000 as the first national marine sanctuary in the Great Lakes, staff and partners have undertaken several expeditions to search for shipwrecks, and have even discovered some that were lost for decades. Probably one of the most notable discoveries within the sanctuary since designation is that of the steamerChoctaw(1892-1915) and wooden bulk freighterOhio(1873-1894) in historic shipping lanes off Presque Isle, Michigan in Lake Huron.

EDUCATION CONNECTION

The Great Lakes Literacy Principles offsite link provide a framework for educators teaching about the Great Lakes, helping teachers and students think about the Great Lakes as a system, rather than a set of unrelated parts. Thinking systemically can provide a greater understanding and help identify solutions to the issues threatening the region.

Keep exploring

Find even more resources on the Great Lakes ecoregion inour searchable resource database.

Data resources

Great Lakes forecast data

Searchable invasive species database

Great Lakes bathymetry maps

Lake level viewer

Great Lakes MODIS Imagery Region Map

National Data Buoy Center

Background information

Great Lakes food web diagrams

Related stories

NOAA teams up with cruise company for Great Lakes research (2020)

Searching for WWII-era aircraft lost in the Great Lakes (2020)

Giant sinkholes are adding water to Lake Huron. Scientists ask: How much? (2019)

The Great Lakes: A national treasure (2017)

NOAA’s lake level viewer for the Great Lakes (2013)

More Collections

Watersheds, flooding, and pollution

Water cycle

Great Lakes ecoregion (2024)

FAQs

Great Lakes ecoregion? ›

The Great Lakes system includes five large lakes, one small lake, four connecting channels, and the St. Lawrence Seaway. The large lakes are Superior, Michigan, Huron, Erie, and Ontario. They hold about 90% of the freshwater in the United States and approximately 20% of the world's freshwater supply.

What is the Great Lakes ecosystem? ›

Just like ocean coasts, the coasts of the Great Lakes feature a variety of ecosystems, such as beaches, dunes and wetlands, but with the notable exception of hosting freshwater species.

What Ecozone are the Great Lakes in? ›

The Mixedwood Plains Ecozone is endowed with abundant freshwater resources, including four of the Great Lakes -- Superior, Huron, Erie, and Ontario -- and the St. Lawrence River from Kingston to Quebec City. These Great Lakes constitute nearly 20% of the world's fresh water.

What ecoregion is Lake Superior in? ›

The Midwest Canadian Shield Forests ecoregion is an immense area stretching from the north shore of Lake Superior in Ontario northwestward through western Ontario and central Manitoba to the south shore of Lake Athabasca in northern Saskatchewan and Alberta.

What type of biome is the Great Lakes? ›

The Western Great Lakes forests is a terrestrial ecoregion as defined by the World Wildlife Fund. It is within the temperate broadleaf and mixed forests biome of North America.

What are the characteristics of the Great Lakes region? ›

The Great Lakes are a crown jewel of North America, holding nearly one-fifth of the planet's surface freshwater. They have nearly 11,000 miles of shoreline and harbor, more than 530,000 acres of coastal wetlands and the world's largest freshwater delta (in Lake St. Clair).

Which region of the United States contains the Great Lakes? ›

The Great Lakes region of Northern America is a binational Canadian–American region centered around the Great Lakes that includes the U.S. states of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania, and Wisconsin and the Canadian province of Ontario.

What is the ecoregion of Lake Erie? ›

The Lake Erie Lowland ecoregion is the southernmost ecoregion in Canada, with its southern limits at the same latitude as northern California. It is highly influenced by the moderating effect of the lower Great Lakes. The landscape is generally flat, with the exception of the Niagara Escarpment.

Where are the Great Lakes region located? ›

It includes parts of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania, Wisconsin, Ontario and Quebec. All together, the Great Lakes contain the 9,402 miles of shoreline and 94,710 total square miles of surface area.

What are the names of the Great Lakes region? ›

The five lakes are Superior, Michigan, Huron, Erie, and Ontario, and they are in general on or near the Canada–United States border. Hydrologically, Michigan and Huron are a single body of water joined at the Straits of Mackinac. The Great Lakes Waterway enables modern travel and shipping by water among the lakes.

What ecoregion is Michigan? ›

Broadly, Michigan spans the transition between the conifer-dominated Northern (Boreal) Forests (which contains the entire Upper Peninsula and 7 of the ecoregions in the Lower Peninsula) and the more southerly, hardwood-dominated Eastern Temperate Forests (containing the remaining 11 ecoregions.)

Which Great Lake is the deepest? ›

Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet). By most measures, it is the healthiest of all the Great Lakes.

What feeds the Great Lakes? ›

The Great Lakes receive their water supply from precipitation, which increases from west to east and from north to south. The average annual rainfall in the Lake Superior basin is 30 inches (760 millimeters), 31 inches in Lakes Huron and Michigan, and 34 and 36 inches in Lakes Erie and Ontario, respectively.

Which Great lake is the least polluted? ›

Watershed's surface: 209,000 square kms. Lake Superior is the largest, cleanest, and wildest of all the Great Lakes.

Why are the Great Lakes so clear? ›

The mussels eat the plankton in the water. Those plankton are the dominant light absorbers. So remove plankton, and the water gets a lot clearer.

Why are the Great Lakes special? ›

The system is invaluable as the source of drinking water for more than 40 million people in the U.S. and Canada. The lakes directly generate more than 1.5 million jobs and $60 billion in wages annually. They're also home for more than 3,500 plant and animal species, some of which are found nowhere else on Earth.

What is the ecosystem of lakes? ›

A pond or lake ecosystem includes biotic (living) plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions. Pond and lake ecosystems are a prime example of lentic ecosystems. Lentic refers to stationary or relatively still water, from the Latin lentus, which means sluggish.

How does the Great Lakes ecosystem work? ›

The Great Lakes are complex ecosystems. There is a natural coupling between river and Great Lakes systems. Many species and species assemblages or communities are co-adapted to features of these complex and coupled systems. Lake sturgeon are members of a group of species referred to as “Benthivores”.

What is the ecosystem of freshwater lakes? ›

Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes, ponds, rivers, streams, springs, bogs, and wetlands. They can be contrasted with marine ecosystems, which have a larger salt content.

What is the Great Lakes Freshwater Ecosystem Initiative? ›

The goal of the Great Lakes Freshwater Ecosystem Initiative (FEI) is to target the most significant environmental challenges affecting Great Lakes water quality and ecosystem health by delivering on Canada's commitments under the Canada-United States Great Lakes Water Quality Agreement (GLWQA).

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