Albert Barnes Commentary Joshua 3:16

"that the waters which came down from above stood, and rose up in one heap, a great way off, at Adam, the city that is beside Zarethan; and those that went down toward the sea of the Arabah, even the Salt Sea, were wholly cut off: and the people passed over right against Jericho." — Joshua 3:16 (ASV)

The passage should read: rose up, a heap far away, by Adam, the city which is beside Zarthan.

The city of Adam is not named elsewhere, and Zarthan (mentioned here and in marginal references) has also disappeared. It is, however, probably connected with the modern Kurn Sartabeh (Horn of Sartabeh), the name given to a lofty and isolated hill some 17 miles on the river above Jericho.