Marah

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.

(bitterness), a place which lay in the wilderness of Shur or Etham, three days journey distant, (Exodus 15:23; Numbers 33:8) from the place at which the Israelites crossed the Red Sea, and where was a spring of bitter water, sweetened subsequently by the casting in of a tree which "the Lord showed" to Moses. Howarah , distant 16 1/2 hours (47 miles) from Ayoun Mousa , the Israelites’ first encampment, has been by many identified with it, apparently because it is the bitterest water in the neighborhood.

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.