Pond

pondspoolpoolsbirkehpokelogansloughbed pondsfish pondsFishing pondholy pond
A pond is an area filled with water, either natural or artificial, that is smaller than a lake.wikipedia
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Lake

lacustrinefreshwater lakenatural freshwater lake
A pond is an area filled with water, either natural or artificial, that is smaller than a lake.
Lakes lie on land and are not part of the ocean, and therefore are distinct from lagoons, and are also larger and deeper than ponds, though there are no official or scientific definitions.

Limnology

limnologistlimnologicallimnologists
Limnologists and freshwater biologists have proposed formal definitions for pond, in part to include 'bodies of water where light penetrates to the bottom of the waterbody,' 'bodies of water shallow enough for rooted water plants to grow throughout,' and 'bodies of water which lack wave action on the shoreline.' Each of these definitions has met with resistance or disapproval, as the defining characteristics are each difficult to measure or verify.
This includes the study of lakes, reservoirs, ponds, rivers, springs, streams, wetlands, and groundwater.

Treatment pond

Among their many uses, ponds provide water for agriculture and livestock, aid in habitat restoration, serve as fish hatcheries, are components of landscape architecture, may store thermal energy as solar ponds, and treat wastewater as treatment ponds.
Ponds are depressions holding water confined by earthen structures.

Alligator

alligatorsGatorGators
Beaver ponds are the best-known example, but alligators also excavate ponds as well.
American alligators live in freshwater environments, such as ponds, marshes, wetlands, rivers, lakes, and swamps, as well as in brackish water.

Fish pond

fishpondfishpondsfishing pond
In medieval times in Europe, it was typical for many monastery and castles (small, partly self-sufficient communities) to have fish ponds.
A fish pond, or fishpond, is a controlled pond, artificial lake, or reservoir that is stocked with fish and is used in aquaculture for fish farming, or is used for recreational fishing or for ornamental purposes.

Kettle (landform)

kettle holekettle lakekettle
It may arise naturally in floodplains as part of a river system, or be a somewhat isolated depression (such as a kettle, vernal pool, or prairie pothole).

Waste stabilization pond

stabilization pondwaste stabilization pondsTreatment pond
Waste stabilization ponds are used as a low-cost method for wastewater treatment.
Waste stabilization ponds (WSPs or stabilization ponds or waste stabilization lagoons) are ponds designed and built for wastewater treatment to reduce the organic content and remove pathogens from wastewater.

Vernal pool

vernal poolstemporary poolephemeral pool
It may arise naturally in floodplains as part of a river system, or be a somewhat isolated depression (such as a kettle, vernal pool, or prairie pothole).

Prairie Pothole Region

prairie potholeprairie potholespothole
It may arise naturally in floodplains as part of a river system, or be a somewhat isolated depression (such as a kettle, vernal pool, or prairie pothole). Retreating glaciers can leave behind landscapes filled with small depressions, each developing its own pond; an example is the Prairie Pothole Region of North America.

Solar pond

solar pondssaltwater thermal sinksolar pool
Among their many uses, ponds provide water for agriculture and livestock, aid in habitat restoration, serve as fish hatcheries, are components of landscape architecture, may store thermal energy as solar ponds, and treat wastewater as treatment ponds.

Wastewater

waste watermunicipal wastewaterwastewater treatment facility
Among their many uses, ponds provide water for agriculture and livestock, aid in habitat restoration, serve as fish hatcheries, are components of landscape architecture, may store thermal energy as solar ponds, and treat wastewater as treatment ponds.

Saline water

salinesalt watersaltwater
Ponds may be fresh, saltwater, or brackish.

Brackish water

brackishbrackishwaterbrackish-water
Ponds may be fresh, saltwater, or brackish.

Hydrobiology

hydrobiologistfreshwater biologistshydrobiological
Limnologists and freshwater biologists have proposed formal definitions for pond, in part to include 'bodies of water where light penetrates to the bottom of the waterbody,' 'bodies of water shallow enough for rooted water plants to grow throughout,' and 'bodies of water which lack wave action on the shoreline.' Each of these definitions has met with resistance or disapproval, as the defining characteristics are each difficult to measure or verify.

Ramsar Convention

RamsarRamsar siteRamsar Convention on Wetlands
The international Ramsar wetland convention sets the upper limit for pond size as 8 ha, but biologists have not universally adopted this convention.

Crystal Lake (Newton, Massachusetts)

Crystal Lake
In North America, even larger bodies of water have been called ponds; for example, Crystal Lake at 33 acre, Walden Pond in Concord, Massachusetts at 61 acre, and nearby Spot Pond at 340 acre.

Walden Pond

Walden Pond State ReservationWalden Woodspond
In North America, even larger bodies of water have been called ponds; for example, Crystal Lake at 33 acre, Walden Pond in Concord, Massachusetts at 61 acre, and nearby Spot Pond at 340 acre.

Concord, Massachusetts

ConcordConcord, MATown of Concord
In North America, even larger bodies of water have been called ponds; for example, Crystal Lake at 33 acre, Walden Pond in Concord, Massachusetts at 61 acre, and nearby Spot Pond at 340 acre.

Middlesex Fells Reservation

Middlesex FellsSpot PondFells Open Reservoir
In North America, even larger bodies of water have been called ponds; for example, Crystal Lake at 33 acre, Walden Pond in Concord, Massachusetts at 61 acre, and nearby Spot Pond at 340 acre.

Depression (geology)

depressionbasindepressions
Any depression in the ground which collects and retains a sufficient amount of precipitation can be considered a pond, and such depressions can be formed by a variety of geological and ecological events.

Amazon River

AmazonRiver AmazonUpper Amazon
Rivers often leave behind ponds in natural floodplains after spring flooding, and these can be very important to breeding fish, particularly in large river systems like the Amazon.

Glacier

glaciersglacialglaciated
Retreating glaciers can leave behind landscapes filled with small depressions, each developing its own pond; an example is the Prairie Pothole Region of North America.

Amphibian

Amphibiaamphibiansamphibious
Many areas of landscape contain small depressions which form temporary ponds after spring snow melts, or during rainy seasons; these are called vernal ponds, and may be important sites for amphibian breeding.

Beaver

Castorbeaversbeaver lodge
Beaver ponds are the best-known example, but alligators also excavate ponds as well.

Wetland

wetlandscoastal wetlandwetland habitat
Often, the entire margin of the pond is fringed by wetland, and these wetlands support the aquatic food web, provide shelter for wildlife, and stabilize the shore of the pond.