Hydrophis obscurus is a species of snakes in the family elapid snakes. They are associated with freshwater habitat. They are found in the indo-malayan realm.
Definition: The largest scale biogeographic division of the earth's surface based on the historic and evolutionary distribution patterns of plants and animals.
Definition: A habitat that is in or on a sea or ocean containing high concentrations of dissolved salts and other total dissolved solids (typically >35 grams dissolved salts per litre).