This is an area near Jerusalem.
When Absalom rebelled, the people who spied on the city's contents and reported them to David hid near this place.
2 Sam 17:17Now Jonathan and Ahimaaz were staying at En-rogel, and a female servant would go and inform them, and they in turn would go and inform King David, for they dared not enter the city and be seen.
When Adonijah arbitrarily declared his succession to the throne, he did so here.
1 Kgs 1:9Adonijah then sacrificed sheep, oxen, and fattened calves by the Stone of Zoheleth, which is beside En-rogel, and invited all his brothers, the king’s sons, and all the men of Judah, the king’s servants.