The children of Israel did so as Joshua commanded, and took up twelve stones out of the midst of the Jordan, as Yahweh spoke to Joshua, according to the number of the tribes of the children of Israel; and they carried them over with them to the place where they lodged, and laid them down there.
Now it'd be fun-They set up two memorials. They took stones and set them in a pile in the Jordan River, and then they also set a pile up on a bank. It'd be fun to get some scuba gear, since they were there to that day, to see if the stones are still there in the Jordan River that Joshua set up.