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Discover the Chesapeake

The Chesapeake Bay - the largest estuary in the United States - is an incredibly complex ecosystem that includes important habitats and food webs. The Bay and its rivers, wetlands and forests provide homes, food and protection for diverse groups of animals and plants. Fish of all types and sizes either live in the Bay and its tributaries year-round or visit its waters as they migrate along the East Coast.

Bay 101

Select a category below to view videos from our Bay Program video library. Prior to using any of these videos, please view our terms of use to learn about usage rights.


Bay 101: Ospreys

Ospreys are a top predator in the Chesapeake Bay, and they help scientists study the effects of toxics on our ecosystem.

The Chesapeake Bay Watershed

A watershed is an area of land that drains to a particular river, lake, bay or other body of water. Watersheds are sometimes called “basins” or "drainage basins."

We all live in a watershed. Some watersheds, like that of your local stream or creek, are small. Others, like the Chesapeake Bay watershed, are very large. Learn more about the Chesapeake Bay watershed.

The Bay Ecosystem

An ecosystem is a complex set of relationships among living and non-living things. Air, water, soil, sunlight, plants and animals – including humans – make up an ecosystem. Ecosystems can be as tiny as a patch of dirt in your backyard, or as large as the entire Chesapeake Bay watershed.

The Bay Ecosystem

The Chesapeake Bay, the largest estuary in the United States, is an extremely productive and complex ecosystem. The Bay ecosystem consists of the Bay itself, its local rivers and streams, and all the plants and animals it supports. Learn more about the Chesapeake Bay ecosystem.

Critter Of The Month

Green Treefrog
Hyla cinerea

The green treefrog is a smooth-skinned frog that can be found along the East Coast. Its bright green coloring serves as effective camouflage against predators.

Chesapeake History

2012

2012
  • Harris Creek becomes the first target of the oyster restoration goals set forth in the Chesapeake Bay Executive Order: to restore oyster populations in 20 Bay tributaries by 2025. In this Choptank River tributary, existing reefs will be studied, new bars will be built and spat-on-shell will be planted.

2011

2011
  • The U.S. Environmental Protection Agency issues a new Municipal Separate Storm Sewer Permit to the District of Columbia. It is the first of its kind to incorporate green infrastructure into its requirements, setting a national model for stormwater management.

2010

2010
  • Maryland, Virginia and New York ban phosphates in dishwasher detergent to lower phosphorous pollution in local waterways.
  • The U.S. Environmental Protection Agency establishes the Total Maximum Daily Load to limit the amount of pollutants that can enter the Chesapeake Bay.
  • The Bay Program launches ChesapeakeStat to improve communication about restoration goals, progress and funding.

2009

2009
  • President Obama signs an executive order that calls on the federal government to renew the effort to protect and restore the watershed.
  • The Chesapeake Executive Council sets two-year milestones to accelerate restoration and increase accountability.
  • Annapolis becomes the first jurisdiction in the watershed to ban phosphorous in lawn fertilizer.

2008

2008
  • Maryland, Virginia and the Potomac River Fisheries Commission issue emergency regulations on the harvest of blue crabs to help the species recover. The Chesapeake Bay’s blue crab fishery is declared a federal disaster.
  • The 2008 Farm Bill dedicates more than $180 million over the course of four years to agricultural conservation.
  • The invasive zebra mussel is found in the Maryland portion of the Susquehanna River.

Bay FAQ


What are chemical contaminants?


How many types of bay grasses grow in the Chesapeake Bay?


Which rivers and streams flow into the Chesapeake Bay?


How do forest buffers protect water quality?


What produces air pollution?


What is the ideal salinity for eastern oysters?


Where do nutrients come from?


What can be done to counter the effects of development that has already occurred?


Do phytoplankton migrate?


What are impervious surfaces?

See more FAQs.

Bay Fun

Bay Facts

Bay FactsEver wondered how big the Chesapeake Bay is? Or how many states are in the Bay watershed? Or how deep the Bay is? Learn all about the Chesapeake Bay and its watershed with these interesting facts and figures.

Coloring Book

Coloring Book Like to color? Get your crayons ready! Pick out a Chesapeake Bay-themed picture from our Bay coloring book. Print it, color it and hang it on the fridge! Or download an entire coloring book and color for days.

Gyotaku

Gyotaku (Fish Printing) Gyotaku (guh-yo-tah-koo) — the Japanese art of fish priting — was developed more than 100 years ago as a way for fisherman to record the size and species of their catch. Learn about this process and print a few of your own!

Bay Photos

Bay Photos Browse through our collection of photos of cool animals that live in the Chesapeake Bay, such as blue crabs and oysters. There's also photos of plants that grow in the shallows of the Bay, parks and lighthouses throughout the Bay region, and much more.

Bay Games

Bay GamesPlay one of these fun, simple games to learn more about the Chesapeake Bay!
Word search: Fish | Birds
Sliding Puzzle: Urchin | Blue Crab | Box Turtle

Bay Glossary

Red tide

A dense outburst of dinoflagellates that colors the water reddish-brown. Certain dinoflagellates can produce toxins that kill fish and contaminate shellfish.

Quality Control (QC)

The overall system of technical activities that measures the attributes and performance of a process, item or service against defined standards to verify that they meet the stated requirements established by the customer; operational techniques and activities that are used to fulfill requirements for quality.

Endemic species

A species that is restricted in its distribution to a particular locality or region.

Wetland

A transitional zone between land and water that is periodically flooded. For example, marshes, swamps and bogs are all wetlands.

Fertilizer

A natural substance or chemical added to soil or land to increase its fertility and help plants grow.

Rain garden

A garden that uses plants and layers of soil, sand and mulch to retain rainwater, reducing the amount of polluted runoff that reaches storm drains and local waterways.

Acid rain

Natural rainfall that contains nitric and sulfuric acids due to nitrogen oxide (NOx) and sulfur dioxide discharged into the air by industries, power plants, automobiles and other emission sources.

Lag-time

The span of time between the adoption of a pollution-reducing practice and the visible effects of that practice on a particular waterway.

See more bay terms.

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