A vlei (; ) is a shallow minor lake, mostly of a seasonal or intermittent nature. It even might refer to seasonal ponds or marshy patches where frogs and similar marsh dwellers breed. Commonly, vleis vary in their extent, or even in the presence or absence of water, according to the fall of rain or dryness of the season."Compendium of South African history and geography", by George McCall Theal, Edition: 3 - 1877
9
/ref> In terms of water

salinity Salinity () is the saltiness or amount of salt (chemistry), salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensio ...

, vleis may be

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mi ...

, saltwater, or

brackish Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...

. Over time a vlei may degrade into a salt pan or clay pan, such as Dead Vlei or Sossusvlei.

Ecology

Vleis of various types can be of considerable local ecological importance, harboring many

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

and migratory species. Most vleis are too minor to be granted recognition in the form of a name. However, some major vleis are accorded names, for example Rondevlei and Zeekoevlei in the

Cape Peninsula The Cape Peninsula () of South Africa is a generally mountainous peninsula that juts out into the Atlantic Ocean at the south-western extremity of the African continent. At the southern end of the peninsula are Cape Point and the Cape of Good ...

, which are permanent bodies of water. Indeed, Rondevlei is home to hippopotamus. The term is the basis of various biological

common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often con ...

s, such as * vlei rat, rodents in the genus ''Otomys'' * '' vleiroos'' (literally "marsh rose") * '' vleikuiken'' (literally "vlei chick") * vlei frog

Etymology

The word ' is used predominantly in South Africa. It is an

Afrikaans Afrikaans is a West Germanic languages, West Germanic language spoken in South Africa, Namibia and to a lesser extent Botswana, Zambia, Zimbabwe and also Argentina where there is a group in Sarmiento, Chubut, Sarmiento that speaks the Pat ...

word derived from the

Middle Dutch Middle Dutch is a collective name for a number of closely related West Germanic dialects whose ancestor was Old Dutch. It was spoken and written between 1150 and 1500. Until the advent of Modern Dutch after 1500 or , there was no overarching sta ...

word for "valley" ('). Unabridged In Afrikaans, however, its meaning changed into that of the shallow lake. The Afrikaans and modern Dutch word for "valley" is '. The North American placename ''

vlaie In the Hudson Valley of eastern United States, a vlaie, vly or fly is a swamp or marsh. It also applies to creeks and areas in the vicinities. The term appears in place names in areas of Dutch influence, formerly New Netherland. Etymology The ...

'' is

cognate In historical linguistics, cognates or lexical cognates are sets of words that have been inherited in direct descent from an etymological ancestor in a common parent language. Because language change can have radical effects on both the s ...

with ', having the same Middle Dutch derivation.

References

{{portalbar, Lakes Ecoregions Intermittent lakes Afrikaans words and phrases