The Barouk mountain comprises rocks from the Pliocene which have undergone major tectonic movement that divided the mountains of Lebanon into two parallel parts; the eastern range is called the Anti-Lebanon, and the western range is called Mount Lebanon. The two mountain ranges are separated by the Beqaa Valley, which is composed of recent infill sediments. The main rocks are limestone. The whole of the Barouk Mountain is cavernous limestone, with many surface features such as dolines indicating the underlying cavernous forms of the mountain range. One particularly noteworthy cave, estimated to be long, is located near Niha village. Villagers report an abundance of stalactites and stalagmites and that there is an underground body of water.