Acacia trees were used as raw material for the construction of the Tabernacle and for the building of its utensils: the Ark of the Covenant, the Altar and the Table and the Pillars of the Curtain.
“And you shall make upright boards for the tabernacle of acacia wood. Ten cubits shall be the length of a board, and a cubit and a half shall be the breadth of one board.” (Exodus XXVI, 15-16
“And Bezalel made the ark of acacia wood; two cubits and a half was its length, and a cubit and a half its breadth, and a cubit and a half its height; And he overlaid it with pure gold inside and outside, and made a rim of gold around it. … And he made poles of acacia wood, and overlaid them with gold. (Exodus XXXVII, 1-2, 4)
Their length was certainly impressive. “Ten cubits shall be the length of a board, and a cubit and a half shall be the breadth of one board.”
In Isaiah’s vision of the flowering of the desert wilderness, the acacia features with non-desert trees:
“I will plant in the wilderness the cedar, the acacia tree, and the myrtle, and the oil tree;” (Isaiah XLI, 19).
Since acacia trees grow in the desert and the Children of Israel needed them for building purposes while they were in the desert, it is reasonable to assume that the identification is correct.