It is a mountain 12 miles east of Mecca, with a height of 150 feet. It is also called the Mountain of Mercy. The pilgrims go to it after Tawaf around Kaaba, to perform the ceremony of standing there at noon time of the 9th of Dhu'l Hijja. The standing there is meant as a presence in that place.
ARAFAT
Meaning of ARAFAT in English
Advanced Islamic English dictionary. Расширенный исламский словарь английского языка. 2012