Jabal an-Nour ( or 'Hill of the Illumination') is a mountain near Mecca in the Hejaz region of Saudi Arabia. The mountain houses the grotto or cave of Hira' (), which holds tremendous significance for Muslims throughout the world, as the Islamic prophet Muhammad is said to have spent time in this cave meditating, and it was here that he received his first revelation, which consisted of the first five ayats of Surah Al-Alaq from the angel Jibra'il (as is pronounced in certain Quran recitation schools and some Arab tribes; also known as Gabriel). It is one of the most popular tourist attractions in Makkah. The mountain itself is barely tall; nonetheless one to two hours are needed to make the strenuous hike to the cave. There are 1750 steps to the top which, even for a fit individual, can take anywhere between half an hour and one-and-a-half hours. Etymology This is where Muhammad is said to have had his first revelation and received five verses of the Quran, the mountain was given the title Jabal an-Nūr ("Mountain of the Light" or "Mountain of the Enlightenment"). This experience is sometimes identified with the beginning of revelation; hence the present name. The date of the first revelation is said to be during the night on August 10, 610 A.D. Or, Monday the 21st of Ramadan, making Muhammad 40 lunar years, 6 months and 12 days of age, i.e. 39 solar years, 3 months and 22 days. Appearance One physical feature that differentiates Jabal al-Nour from other mountains and hills is its unusual summit, which makes it look as if two mountains are on top of each other. The top of this mountain in the mountainous desert is one of the loneliest of places. However, the cave within, which faces the direction of the Kaaba, is even more isolated. While standing in the courtyard back then, people could only look over the surrounding rocks. Nowadays, people can see the surrounding rocks as well as buildings that are hundreds of meters below and hundreds of meters to many kilometers away. Hira is both without water or vegetation other than a few thorns. Hira is higher than Thabīr (), and is crowned by a steep and slippery peak, which Muhammad with some companions once climbed. Geology The mountain is composed of intrusive igneous rocks, predominantly Precambrian aged coarse grained hornblende tonalite, with subordinate granodiorite.