During your exploration of Albaicín, you will notice several small brick buildings and standalone rounded arches. These are cisterns called Aljibes. The Muslims built an elaborate irrigation system to capture, store and distribute portable water throughout the Albaicín. The fountains also allowed the Muslims to wash before praying. 25 of these cisterns still exist. This is Aljibe de San Nicolás. The underground tank could hold over 16,000 gallons of water. As its name implies, it is adjacent to the Church of San Nicolás.