What makes a lake vs a pond?

It may surprise you to know there is no technical difference between lakes and ponds, according to the National Park Service(Opens in a new window). However, a general rule of a thumb is if a body of water is large and deep it's a lake and if it's short and shallow it's a pond.



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During the summer, if a waterbody is deep enough to stratify into three distinct layers, with one warm layer on top, one cold layer at the bottom and a layer of rapidly changing temperature in between (called a “thermocline”), then it is a “lake,” while a waterbody with one or two weakly defined layers is a “pond.”

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Every Pond or lake has several different zones that divide the water column from top to bottom and side to side. These zones consist of the Littoral Zone, Limnetic Zone, Profundal Zone, Euphotic Zone, and Benthic Zone.

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Lakes are classified based on productivity, or how much photosynthesis is occurring in the water.
  • Oligotrophic lakes have low levels of productivity, these are often clearer water.
  • Mesotrophic lakes have a middle level of productivity. ...
  • Eutrophic lakes are high in productivity, so high they can be green in color.


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Along with water quality, it is important that the physical characteristics of a pond are appropriate for swimming. The depth of the pond can often determine if it is safe to swim. In addition, sunken trees and submerged rocks can be invisible from the surface of the water and can pose a danger to swimmers.

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Located in Russia in the southern region of Siberia, Lake Baikal is the world's largest freshwater lake by both volume (22995 km3) and depth (1741m). Lake Baikal contains 20% of the world's fresh surface water. Lake Baikal hides its vast waters under a relatively small surface area (31500 km2).

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Lakes lifespans are limited, as rivers dump their sediment into them and dead plant material builds up on the lake bottom. Most lakes are less than 10,000 years old.

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Exorheic, or open lakes drain into a river, or other body of water that ultimately drains into the ocean. Endorheic basins fall into the category of endorheic or closed lakes, wherein waters do not drain into the ocean, but are reduced by evaporation, and/or drain into the ground.

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For a lake to keep its water over time, it has to be replenished. There are both natural and man-made lakes. The main way that water gets into reservoirs and man-made lakes is from the rivers and streams that were dammed to create them.

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From a naming convention, there is no precise difference between a lake and pond, although waterbodies named “lakes” are generally larger and/or deeper than waterbodies named “ponds.” From an ecological or limnological perspective, there is a difference between the two.

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