Valley of Baca

Concise Bible Dictionary:

This signifies “weeping.” The blessedness of going up to the courts of Jehovah turns “the valley of tears” into “the fountain of joy” (Psa. 84:66Who passing through the valley of Baca make it a well; the rain also filleth the pools. (Psalm 84:6)). The article being before the name seems to imply that some natural valley was before the eye of the Psalmist though unknown now.

Jackson’s Dictionary of Scripture Proper Names:

the weeper