I. The hydrological cycle. Global ocean surface and deep-sea currents. Volcanic island arcs. Last ice age, ice sheets, and glaciers. The oceanic microbial soup. II. Rivers and craters on Mars. Surfaces of Jupiter's moons Ganymede, Callisto, and Europa. III. Phase diagram of water. The water molecule. The hydrogen bond. Structures of liquid water and ice. Snowflakes and dendrides. Computer models. Anomalies of water. Incipient liquid-liquid criticality in water. IV. Flow through nanotubes. Water in biological systems. V. Urban distribution of water in Istanbul through history. Geopolitics of water.