Similar to these social measures for water preservation, biological structures exhibit their own measures. In the human body, subarachnoid cisterns of central nervous system are the best-known cisterns, despite the presence of the cisterna chyli and Golgi body. The central nervous system produces and stores water in the form of cerebrospinal fluid in the subarachnoid cisterns for mechanical and immunological protection of the anatomical structures and for autoregulation of cerebral blood flow every day. Any condition that may adversely affect the cisterns, public or subarachnoid, may cause serious and irreversible damage to life. Hence, we should appreciate the importance of water for life; moreover, ?if there is water there is life? is not a great prophecy. Keywords : Byzantium, Cisterna, Cisterna chyli, Golgi body, Subarachnoid cisterna