Pond

pondspoolpoolssloughbirkehbed pondsfish pondsFishing pondholy pondmodel boat pond
A pond is a body of standing water, either natural or artificial, that is usually smaller than a lake.wikipedia
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Body of water

bodies of waterwater bodieswaterbodies
A pond is a body of standing water, either natural or artificial, that is usually smaller than a lake.
The term most often refers to oceans, seas, and lakes, but it includes smaller pools of water such as ponds, wetlands, or more rarely, puddles.

Lake

lacustrinefreshwater lakelakes
A pond is a body of standing water, either natural or artificial, that is usually 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.

Fish pond

fishpondfishpondsfishing pond
Fish ponds are designed for commercial fish breeding, and solar ponds are designed to store thermal energy.
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.

Water garden

aquatic gardenWater featuresWater Gardening
Others, like water gardens, water features and koi ponds are designed for aesthetic ornamentation as landscape or architectural features.
The primary focus is on plants, but they will sometimes also house ornamental fish, in which case the feature will be a fish pond.

Treatment pond

Treatment ponds
Treatment ponds are used to treat wastewater.
Ponds are depressions holding water confined by earthen structures.

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.

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
Vernal ponds are ponds which dry up for part of the year.
Pond

Water stagnation

stagnant waterstagnantstanding water
A pond is a body of standing water, either natural or artificial, that is usually smaller than a lake.

Solar pond

solar pondssaltwater thermal sinksolar pool
Fish ponds are designed for commercial fish breeding, and solar ponds are designed to store thermal energy.

Wastewater

waste waterwastewater treatment facilitymunicipal wastewater
Treatment ponds are used to treat wastewater.

Puddle

puddlesephemeral freshwater habitatmud puddle
Standing bodies of water (puddles, ponds, and lakes) are often categorized separately from flowing watercourses (brooks, creeks, streams or rivers).

Algae scrubber

nitrate reductiondenitratorturf algae
Nutrient levels and water quality in ponds can be controlled through a natural process such as algal growth, or through artificial filtration, such as an algae scrubber.

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.

Acre

acresacreageac
Researchers for the British charity Pond Conservation have defined a pond to be 'a man-made or natural waterbody that is between 1 m 2 and 20,000 m 2 in area (2 ha or ~5 acres), which holds water for four months of the year or more.' Other European biologists have set the upper size limit at 5 ha.

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 Woodspondsimilarly named pond
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 Pond
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)

depressionbasinwaterhole
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

AmazonAmazon River Basinupper 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.

Prairie Pothole Region

prairie potholeprairie potholespothole
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

amphibiansAmphibiaamphibious
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.