In multiplayer maps, Water appears in Mahi-Mahi Resort, Bluefin Depot, Arowana Mall, Camp Triggerfish, Saltspray Rig, Piranha Pit, Inkblot Art Academy, Manta Maria, Snapper Canal, Starfish Mainstage, and The Reef.
- Squids, octopuses, and salmon fish are animals that live within water. While the Salmonids can swim within water and move on land, the Inklings, Octarians, and Octolings (which were derived from squids and octopuses) will dissolve if they touch water because their fragile bodies consist of Ink, which also allows them to swim within Ink.
- Thousands of years before the events of Splatoon, the oceans' rising levels drowned out much of Earth's landmasses and its inhabitants except for Judd and Li'l Judd.
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