Bible dictionaries
Marah
What Bible dictionaries say about “Marah”, one article after the other.
Easton’s Bible Dictionary & Webster’s 1828 Dictionary
Marah - (Easton's Bible Dictionary)
Bitterness, a fountain at the sixth station of the Israelites (Ex. 15:23, 24; Num. 33:8) whose waters were so bitter that they could not drink them. On this account they murmured against Moses, who, under divine direction, cast into the fountain "a certain tree" which took away its bitterness, so that the people drank of it. This was probably the Ain Hawarah, where there are still several springs of water that are very "bitter," distant some 47 miles from Ayun Mousa.
Matthew George Easton, Easton’s Bible Dictionary; Noah Webster, American Dictionary of the English Language (1828)
The article in Easton + Webster 1828International Standard Bible Encyclopedia (ISBE 1915)
ma'-ra, mar'-a (marah, "bitter"): The first camp of the Israelites after the passage of the Red Sea (Ex 15:23; Nu 33:8 f). The name is derived from the bitterness of the brackish water. Moses cast a tree into the waters which were thus made sweet (Ex 15:23).
See WANDERINGS OF ISRAEL.
International Standard Bible Encyclopedia — James Orr, general editor and contributors; CrossWire SWORD module ISBE 2.2
The article in ISBE 1915Smith’s Bible Dictionary
William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3
The article in Smith