For being now in the middle, and lowest, and deepest place of the river, (of which See Poole on "Joshua 3:17",) they are most properly said to ascend or go up to the land; which word is thrice used ill this and the two next following verses.
Related Commentaries of Joshua 4:16
Joshua 4:16
16 Command the priests that bear the ark of the testimony, that they come up out of Jordan.