'Edge' in the Bible

And fifty men of the sons of the prophets went out and took their places facing them a long way off, while the two of them were by the edge of Jordan.

Then he took up Elijah's robe, which had been dropped from him, and went back till he came to the edge of Jordan.

Now all Moab, hearing that the kings had come to make war against them, got together all who were able to take up arms and went forward to the edge of the country.