Chefchaouen is one of the few places in Morocco where everyone can drink the tap water. Ice-cold water come flushing down from the mountains, so there is virtually nothing that pollutes it only oxygen that is whipped into it.
Right north of the old city, the Ras el-Ma is located, and this is the source that feeds all of Chefchaouen's inhabitants with the water. The surroundings are very nice, with big trees with flowers and a small system of passageways and small bridges. This is also the point where the mountain walls become too steep for any settlements, something that adds to the quiet, yet remarkable atmosphere.