Ocean / Legends An ocean was a large body of liquid — usually water , although the lava fields of Mustafar were a notable exception . There were a number of planets that consisted entirely of oceans , like Dac and Manaan . Certain ice planets also had a liquid ocean under the layers of ice , due to core heating , such as Helska IV . Impact . Oceans generally played a significant part in a planet ' s ecosystem , depending on the climate of the particular world , and affected the general habitability of the world for most species . However , it was by no means a mark of ability to sustain life . Despite the lack of significant bodies of water , arid worlds such as Tatooine sustained life through the use of moisture vaporators , albeit in a limited fashion . Not all such worlds used moisture vaporators ; on Cona , the native Arcona harvested water from plant pods . The presence of water , or lack thereof , could possibly have had a major impact on the species inhabiting that world . On the dry and arid world of Kamar , an organization called the Cult of Varn held an understandable reverence for water . Biology of aquatic species . Some oceans in particular were full of a variety of life forms . For example , the waters of the oceanic world of Dac , better known as Mon Calamari to the rest of the known galaxy , have produced no less than five sentient species , including the whale - like Whaladon s . Aquatic species , such as the Mon Calamari and the Quarren , generally did not enjoy arid environments , preferring humid ones . The quarters of Jedi Master Bant Eerin were constantly kept misty and humid . The planet of Naboo contained vast uncharted oceans filled with dangerous creatures . Hazards . Pollution was sometimes a problem for aquatic - based creatures and species . In the event of an industrial accident , currents would spread pollutants and other hazardous material fairly quickly , depending on the scale of the accident or size of the oceans . On ocean - covered planets , this potentially had widespread and disastrous ramifications , with far - reaching consequences . The aquatic planet of Manaan was the sole producer of kolto , a healing fluid generally believed to be produced with the aid of the Progenitor . History . A planet could be submerged under an ocean by a climate change ; this was the case with Kamino , which underwent the so - called Great Flood in 19 , 000 BBY . Due to the fragile nature of their home waters , aquatic species tended to be environmentally conscious , although that was not a trait unique to marine species ; Ergesh and Alderaanians were two groups that took great care of their natural environments . Conversely , on Coruscant , all natural bodies of water were drained and stored to provide for the multitudes of beings that called it home . The largest body of water , the artificial Great Western Sea , was the only remaining such body of water and was used as a tourist destination prior to the Battle of Coruscant , while afterwards it became a succession pool . During the Second Imperial Civil War , under the guise of it being Darth Krayt ' s wishes , Darth Wyyrlok ( III ) ordered the immediate destruction of Dac ' s ecosystem , with the desire to render the entire planet unsuitable for life at the hands of Vul Isen ' s viral spore s as a part of the Final Protocol . It succeeded in poisoning the waters of the world within a week , killing billions and concluded the Genocide on Dac , rendering the world uninhabitable . Behind the scenes . The computer game " " has a dark - side option for the player where Revan pumps a toxin into the water , thereby destroying the planet - wide production of kolto . This affected medicine prices , as kolto was used widely before the introduction of bacta .