(the acacias ), the place of Israel’s encampment between the conquest of the transjordanic highlands and the passage of the Jordan. (Numbers 25:1; 33:49; Joshua 2:1; 3:1; Micah 6:5) Its full name appears to be given in the first of these passage --Abel has-Shittim, "the meadow, or moist place, of the acacias." it was "in the Arboth-moab, by Jordan-Jericho," (Numb 22:1; 26:3; 31:12; 33:48,49
That is to say, it was in the Arabah or Jordan valley, opposite Jericho.
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Smith, William, Dr. "Entry for 'Shit’tim'". "Smith's Bible Dictionary".