Easton's Bible Dictionary Baca, Valley of (Psalm 84:6; R.V., "valley of weeping, " marg., "or balsam trees"), probably a valley in some part of Palestine, or generally some one of the valleys through which pilgrims had to pass on their way to the sanctuary of Jehovah on Zion; or it may be figuratively "a valley of weeping." Int. Standard Bible Encyclopedia BACA ba'-ka bakha': In the King James Version in Psalm 84:6, where the Revised Version (British and American) has "the valley of Weeping," with a marginal variant which is best put in the form, "the valley of the balsam-trees." The word is elsewhere used only in the duplicated account of one of David's battles (2 Samuel 5:23, 24 1 Chronicles 14:14, 15). There the translation is "the mulberry trees," with "the balsam-trees" in the margin in the Revised Version (British and American). Conjecturally the word is, by variant spelling, of the stem which denotes weeping; the tree is called "weeper" from some habit of the trickling of its gum or of the moisture on it; the valley of weeping is not a geographical locality, but a picturesque expression for the experiences of those whose strength is in Yahweh, and who through His grace find their sorrows changed into blessings. Willis J. Beecher

Multi-Version Concordance Baca (1 Occurrence) Psalms 84:6 Who passing through the valley of Baca make it a well; the rain also filleth the pools. (KJV JPS DBY WBS NAS RSV NIV)