An altar. Literally, “the altar.” According to v. 28, it was modeled after the altar of Jehovah, a copy of the one altar that God had given to Israel on which to offer their sacrifices; hence the article in the Hebrew, indicating the one altar.
Over against. Literally, “to the forefront.” The Heb. mul means “front,” and is so translated in most places. From the standpoint of directions, “front” may mean east as “right” means south, and “left,” north. If such is the usage of the word here, then the phrase would refer to the entrance to the land of Canaan from the east, or to the eastern shore itself.
In the borders. This is the same expression as in v. 10, and again the LXX and the Syriac read, “Gilgal.”
At the passage. Heb. ’el ‘eber, literally, “unto over.” ‘Eber also means “ford,” or “passage,” which seems to confirm what was suggested (see on v. 10) as the most probable place of crossing. The word, however, also has the sense of “across,” so again, it cannot be definitely determined on which side of the Jordan the altar was built. It was probably to the east of the river (see PP 519).