He hath compassed the waters with bounds>(Job 26:10)
Brackish water is water that has more salinity than fresh water, but not as much as seawater. It may result from mixing of seawater with fresh water, as in estuaries, or it may occur in brackish fossil aquifers. The word comes from the Low German root "brak," meaning "salty". Certain human activities can produce brackish water, in particular certain civil engineering projects such as dikes and the flooding of coastal marshland to produce brackish water pools for freshwater prawn farming. Brackish water is also the primary waste product of the salinity gradient power process. Because brackish water is hostile to the growth of most terrestrial plant species, without appropriate management it is damaging to the environment (see article on shrimp farms).
Lake Maracaibo in Venezuela is a large brackish water bay.
Technically, brackish water contains between 0.5 and 30 grams of salt per litre—more often expressed as 0.5 to 30 parts per thousand (ppt or ‰). Thus, brackish covers a range of salinity regimes and is not considered a precisely defined condition. It is characteristic of many brackish surface waters that their salinity can vary considerably over space and/or time.
"When he compassed the sea with its bounds, and set a law to the waters that they should not pass their limits:(Provebs 8:29)
" And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.(Gen.1:6-7)