American Tract Society Bible Dictionary
Bitterness, a well near the Red Sea, three days' journey from the point where the Israelites crossed it. The well was sweetened for the use of the distressed Hebrews by the miraculous efficacy imparted to the branches of a certain tree which Moses threw in, Exodus 15:23-25 . No plant is now known possessed of such a quality. The name Amarah now marks the dry bed of a wintry torrent, a little south of which is a well called Hawara, which answers well to the description. Its water, after remaining a few seconds in the mouth, becomes exceedingly nauseous. The Arabs do not drink it though their camels will. See also Ruth 1:20 .
These files are public domain and are a derivative of the topics are from American Tract Society Bible Dictionary published in 1859.
Rand, W. W. Entry for 'Marah'. American Tract Society Bible Dictionary. https://www.studylight.org/dictionaries/eng/ats/m/marah.html. 1859.