Yes, there are specific rules: fresh <0.5ppt, brackish 0.5-30ppt, saline 30-50ppt, brine >50ppt. Most seawater is rather brackish. (1ppt=1g/L)What is the boundary between saltwater and freshwater? On the wiki it says .2% salt concentration, but on some tests a 2% concentration would be considered "brackish". This is really confusing me. Is there a definite boundary or is it just like rivers/streams where there are only opinions on the differences between?
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