Hydrus (the water snake) is a minor southern constellation. It was introduced by Johann Bayer in 1603. It should not be confused with Hydra.
... of it is land and 1.0 km² (0.4 mi²) of it is water. The total area is 6.21% water. Demographics As of the census of 2000, there are 16,146 people, 5,480 ...